Starship development history

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The SpaceX Starship system[1] is a fully-reusable, two-stage-to-orbit, super heavy-lift launch vehicle[2] under development by SpaceX since 2012, as a self-funded private spaceflight project.[3][4] It is designed to be a long-duration cargo and, eventually,[5] passenger-carrying spacecraft.[6]

While the Starship program had only a small development team during the early years, and a larger development and build team since late 2018, SpaceX CEO Elon Musk made Starship the top SpaceX development priority following the first human spaceflight launch of Crew Dragon in May 2020, except for anything related to reduction of crew return risk.[7]

Background[edit]

The launch vehicle was initially mentioned in public discussions by SpaceX CEO Elon Musk in 2012 as part of a description of the company's overall Mars system architecture, then known as Mars Colonial Transporter (MCT).[8] It was proposed as a privately funded development project to design and build a spaceflight system[9] of reusable rocket engines, launch vehicles and space capsules to eventually transport humans to Mars and return them to Earth.

As early as 2007 however, Musk had stated a personal goal of eventually enabling human exploration and settlement of Mars.[10][11] Bits of additional information about the mission architecture were released in 2011–2015, including a 2014 statement that initial colonists would arrive at Mars no earlier than the middle of the 2020s,[8] and SpaceX began development of the large Raptor rocket engine for the MCT before 2014.

Musk stated in a 2011 interview that he hoped to send humans to Mars' surface within 10–20 years,[11] and in late 2012 that he envisioned the first colonists arriving no earlier than the middle of the 2020s.[8][12][13]

In October 2012, Musk first publicly articulated a high-level plan to build a second reusable rocket system with capabilities substantially beyond the SpaceX launch vehicles on which SpaceX had by then spent several billion US dollars.[14] This new vehicle was to be "an evolution of SpaceX's Falcon 9 booster ... much bigger [than Falcon 9]." But Musk indicated that SpaceX would not be speaking publicly about it until 2013.[8][15] In June 2013, Musk stated that he intended to hold off any potential IPO of SpaceX shares on the stock market until after the "Mars Colonial Transporter is flying regularly."[16][17]

In February 2014, the principal payload for the MCT was announced to be a large interplanetary spacecraft, capable of carrying up to 100 tonnes (220,000 lb) of passengers and cargo.[18] Musk stated that MCT will be "100 times the size of an SUV".[19] According to SpaceX engine development head Tom Mueller, concept designs at the time indicated SpaceX could use nine Raptor engines on a single rocket, similar to the use of nine Merlin engines on each Falcon 9 booster core, in order "to put over 100 tons of cargo on Mars."[19] At that time, it appeared that the large rocket core that would be used for the booster to be used with MCT would be at least 10 meters (33 ft) in diameter—nearly three times the diameter and over seven times the cross-sectional area of the Falcon 9 booster cores—and was expected to have up to three rocket cores with a total of at least 27 engines.[9]

By August 2014, media sources speculated that the initial flight test of the Raptor-driven super-heavy launch vehicle could occur as early as 2020, in order to fully test the engines under orbital spaceflight conditions; however, any colonization effort was then reported to continue to be "deep into the future".[20][21]

Interplanetary Transport System[edit]

Interplanetary Spaceship design concept, 2016 (with nine Raptor engines)

In January 2015, Musk said that he hoped to release details of the "completely new architecture" for the Mars transport system in late 2015 but those plans changed and, by the end of the year, the plan to publicly release additional specifics had moved to 2016.[18][22] Musk stated in June 2016 that the first uncrewed MCT Mars flight could happen as early as 2022, to be followed by the first crewed MCT Mars flight departing as early as 2024.[23][24] By mid-2016 the company continued to call for the arrival of the first humans on Mars no earlier than 2025.[23] By 2016, the rocket had not yet been given a formal name by SpaceX, although Musk commented on a proposal on Twitter to name it "Millennium".[25] In his September 2016 announcement, Musk referred to the vehicle versions as the "ITS booster", the "Interplanetary Spaceship", and the "ITS tanker".

In mid-September 2016, Musk noted that the Mars Colonial Transporter name would not continue, as the system would be able to "go well beyond Mars", and that a new name would be needed. The name selected was Interplanetary Transport System (ITS), although in an AMA on Reddit on 23 October 2016, Musk stated, "I think we need a new name. ITS just isn't working. I'm using BFR and BFS for the rocket and spaceship, which is fine internally, but...", without stating what the new name might be.[26]

Musk unveiled details of the space mission architecture, launch vehicle, spacecraft, and Raptor engines that power the vehicles at the 67th International Astronautical Congress on 27 September 2016. The first firing of a Raptor engine occurred on a test stand in September 2016 as well.[27][28]

In October 2016, Musk indicated that the initial prepreg carbon-fiber tank test article, built with no sealing liner, had performed well in initial cryogenic fluid testing, and that a pressure test of the tank at approximately 2/3 of the design burst pressure was slated for later in 2016, with the very large tank placed on an ocean barge for the test.[29] This test was successfully completed in November 2016.[30]

In July 2017, Musk indicated that the architecture had "evolved quite a bit" since the 2016 articulation of the Mars architecture. A key driver of the updated architecture was to be making the system useful for substantial Earth-orbit and cislunar launches so that the system might pay for itself, in part, through economic spaceflight activities in the near-Earth space zone.[31] In September 2018, a less drastic redesign was announced, stretching the second stage slightly and adding radially-steerable forward canards and aft fins, used for pitch control in a new reentry profile resembling a descending skydiver. The aft fins act as landing legs, with a third leg on the top that looks identical but serves no aerodynamic purpose.[32]

Design[edit]

The ITS stack was composed of two stages. The first stage was always to be an "ITS booster" while the second stage would have been either an "Interplanetary Spaceship" (for beyond-Earth-orbit missions) or an "ITS tanker" (for on-orbit propellant transfer operations).

Both stages of the ITS were to be powered by Raptor bipropellant liquid rocket engines utilizing the full flow staged combustion cycle with liquid methane fuel and liquid oxygen oxidizer.[33] Both propellants would be fully in the gas phase before entering the Raptor combustion chamber.[9] Both stages were intended to utilize a bleed-off of the high-pressure gas for autogenous pressurization of the propellant tanks, eliminating the problematic high-pressure helium pressurization system used in the Falcon 9 launch vehicle.[34][35] The self-pressurization gas system is a critical part of SpaceX strategy to reduce launch vehicle fluids from five in their legacy Falcon 9 vehicle family to just two, eliminating not only the helium tank pressurant but all hypergolic propellants as well as nitrogen for cold-gas reaction-control thrusters.[27]

The overall launch vehicle height, first stage and the integrated second-stage/spacecraft, was 122 m (400 ft).[36] Both stages of the ITS were to have been constructed of lightweight-yet-strong carbon fiber, even the deep-cryogenic propellant tanks, a major change from the aluminum-lithium alloy tank and structure material used in SpaceX Falcon 9 family of launch vehicles. Both stages are fully reusable and will land vertically, technology initially developed on the Falcon 9 launch vehicle first stages in 2012–2016.[34][35] Gross liftoff mass is 10,500 tonnes (23,100,000 lb) at a lift-off thrust of 128 meganewtons (29,000,000 lbf). ITS would be able to carry a payload to low-Earth orbit of 550 tonnes (1,210,000 lb) in expendable-mode and 300 tonnes (660,000 lb) in reusable mode.[37]

ITS booster[edit]

The ITS booster was a 12 m-diameter (39 ft), 77.5 m-high (254 ft), reusable first stage, to be powered by 42 sea-level rated Raptor engines producing some 3,024 kilonewtons (680,000 lbf) of thrust in each engine. Total booster thrust would have been approximately 130 MN (29,000,000 lbf), several times the 36 MN (8,000,000 lbf) thrust of the Saturn V Moon mission launch vehicle.[34]

The design engine configuration included 21 engines in an outer ring and 14 in an inner ring, with these 35 engines fixed in place. The center cluster of seven engines were to be gimbaled for directional control, although some directional control to the rocket was to be performed by utilizing differential thrust on the fixed engines. Design thrust on each engine was aiming to be variable between 20 and 100 percent of rated thrust.[35]

Methane/oxygen would also be used to power the control thrusters, as gas thrusters rather than the subcooled liquid used to power the main engines. The methalox control thrusters were to be used to control booster orientation in space, as well as to help provide additional accuracy in landing once the velocity of the descending booster has slowed.[35]

The design was intended to achieve a separation velocity of approximately 8,650 km/h (5,370 mph) while retaining about 7% of the total initial propellant load to bring the booster back to the launch pad for a vertical landing, to be followed by assessment and relaunch.[35][38]

The design called for grid fins to be used during atmospheric reentry, once the atmosphere is sufficiently dense, to control the attitude of the rocket and fine-tune the landing location.[35] The booster return flights were expected to encounter loads lower than those experienced on the Falcon 9 reentries, principally because the ITS would have both a lower mass ratio and a lower density than Falcon 9.[29] The booster was to be designed for 20 g nominal loads, and possibly as high as 30–40 gs without breaking up.[29]

In contrast to the landing approach used on SpaceX's mid-2010s reusable rocket first stages—either a large, flat concrete pad or downrange floating landing platform used with Falcon 9 and Falcon Heavy—the ITS booster was to be designed to land on the launch mount itself, where it may then be refilled with propellant and checked out for follow-on flights.[35]

Spacecraft that operate briefly as upper stages during launch[edit]

The ITS did not have a dedicated and single-function second stage in the way most launch vehicles have had. Instead, the upper stage function of gaining sufficient velocity to place a payload into Earth orbit is provided as a relatively short term role by a spacecraft that has all the requisite systems for long-duration spaceflight.[35] This is not a role that most upper stages have had in launch vehicle designs through the 2010s, as typical upper stage on-orbit life is measured in hours. Previous exceptions to this norm exist, for example the Space Shuttle orbiter provided part of the boost energy and all of the second stage energy for lofting itself into low-Earth orbit. Differences also exist: the Space Shuttle expended its propellant tank and primary launch vehicle structure on ascent, whereas the ITS first- and second-stage options are designed to be fully reusable. In the early days of spaceflight, using the upper stage as a spacecraft bus was a relatively common practice. For example, the RM-81 Agena upper stage formed the basis of numerous satellites such as the CORONA series, ARGON, LANYARD, GAMBIT, the Agena target vehicle, Seasat, RHYOLITE, SNAP-10A, and others.

In the 2016 design, SpaceX had identified two spacecraft that would also play the upper stage role on each Earth-away launch: the "Interplanetary Spaceship" and the "ITS tanker". Both spacecraft are the same physical external dimensions: 49.5 m (162 ft)-long and 12 m (39 ft)-diameter 17 m (56 ft) across at the widest point. Both designs were powered by six vacuum-optimized Raptor engines, each producing 3.5 MN (790,000 lbf) thrust, and were to have had three lower-expansion-ratio Raptor engines for in-space maneuvering as well as during descent and landing to allow for reuse on future launches.[34][37]

Interplanetary Spaceship[edit]

The Interplanetary Spaceship was a large passenger-carrying spacecraft design proposed by SpaceX as part of their ITS launch vehicle in September 2016. The ship would operate as a second-stage of the orbital launch vehicle on Earth-ascents—and would also be the interplanetary transport vehicle for both cargo and passengers—capable of transporting up to 450 tonnes (990,000 lb) of cargo per trip to Mars following propellant-refill in Earth orbit.[34]

In addition to use during maneuvering, descent and landing, the three lower-expansion-ratio Raptor engines were also to have been used for initial ascent from the surface of Mars.[34] In 2016, the first test launch of a spaceship was not expected until 2020 or later, and the first flight of the ITS booster was expected to follow a year or more later.[39]

Early Mars flights—in the mid-2020s or later—were expected to carry mostly equipment and few people.[8]

ITS tanker[edit]

The ITS tanker is a propellant tanker variant of the ITS second stage. This spacecraft design was to be used exclusively for launch and short-term holding of propellants to be transported to low-Earth orbit. Once on orbit, a rendezvous operation was to have been effected with one of the Interplanetary Spaceships, plumbing connections made, while a maximum of 380 tonnes (840,000 lb) of liquid methane and liquid oxygen propellants would be transferred in one load to the spaceship. To fully fuel an Interplanetary Spaceship for a long-duration interplanetary flight, it was expected that up to five tankers would be required to launch from Earth, carrying and transferring a total of nearly 1,900 tonnes (4,200,000 lb) of propellant to fully load the spaceship for the journey.[37][35]

Following completion of the on-orbit propellant offloading, the reusable tanker was to reenter the Earth's atmosphere, land, and be prepared for another tanker flight.[37]

Reusability[edit]

2016 artist's concept of ITS booster returning to the launch pad

Both stages were to be designed by SpaceX to be fully reusable and were to land vertically, using a set of technologies previously developed by SpaceX and tested in 2013–2016 on a variety of Falcon 9 test vehicles as well as actual Falcon 9 launch vehicles.[34]

Importantly, the "fully and rapidly reusable" aspect of the ITS design was the largest factor in the SpaceX analysis for bringing down the currently huge cost of transporting mass to space, in general, and to interplanetary destinations, in particular. While the transport system under development in 2016-2017 relied on a combination of several elements to make long-duration beyond Earth orbit (BEO) spaceflights possible by reducing the cost per ton delivered to Mars, the reusability aspect of the launch and spacecraft vehicles alone was expected by SpaceX to reduce that cost by approximately 2 1/2 orders of magnitude over what NASA had previously achieved on similar missions. Musk stated that this is over half of the total 4 1/2 orders of magnitude reduction that he believes is needed to enable a sustainable settlement off Earth to emerge.[40][37]

Operations concept[edit]

The concept of operations for ITS launches envisioned the fully loaded second-stage reaching orbit with only minimal propellant remaining in the Interplanetary Spaceship's tanks. Then, while the spaceship remained in Earth orbit, three to five ITS tankers would be launched from Earth carrying additional methane fuel and liquid oxygen oxidizer to rendezvous with, and transfer propellant to, the outgoing spaceship. Once refueled, the spaceship was to perform a trans-Mars injection burn, departing Earth orbit for the interplanetary portion of the journey.[34]

Big Falcon Rocket[edit]

2017 artist's concept of BFS cargo

In September 2017, at the 68th annual meeting of the International Astronautical Congress, SpaceX unveiled the updated vehicle design. Musk said, "we are searching for the right name, but the code name, at least, is BFR."[41]

The Big Falcon Rocket (BFR), also informally known as Big Fucking Rocket, was a 9-meter (30 ft) diameter carbon-composite launch vehicle, using methalox-fueled Raptor rocket engine technology directed initially at the Earth-orbit and cislunar environment, later, for flights to Mars.[42][43]

The BFR was cylindrical and included a small delta wing at the rear end which included a split flap for pitch and roll control. The delta wing and split flaps were said to be needed to expand the flight envelope to allow the ship to land in a variety of atmospheric densities (none, thin, or heavy atmosphere) with a wide range of payloads (small, heavy, or none) in the nose of the ship.[42][41]:18:05–19:25 Three versions of the ship were described: BFS cargo, BFS tanker, and BFS crew. The cargo version would be used to launch satellites to low Earth orbit—delivering "significantly more satellites at a time than anything that has been done before"[42]—as well as for cargo transport to the Moon and Mars. After retanking in a high-elliptic Earth orbit the spaceship was being designed to be able to land on the Moon and return to Earth without further refueling.[42][41]:31:50

The engine layout, reentry aerodynamic surface designs, and even the basic material of construction have each changed markedly since the initial public unveiling of the BFR in 2017, in order to balance objectives such as payload mass, landing capabilities, and reliability. The initial design at the unveiling showed the ship with six Raptor engines (two sea-level, four vacuum), aerodynamic control surfaces of a delta wing with split flaps, and a plan to build both stages of the launch vehicle out of carbon composite materials.[41]

By late 2017, SpaceX added a third sea-level engine to the conceptual design to increase engine-out capability and allow landings with greater payload mass, bringing the total number of engines to seven.[44]

Additionally, the BFR was shown to theoretically have the capability to carry passengers and/or cargo in rapid Earth-to-Earth transport, delivering its payload anywhere on Earth within 90 minutes.[42]

By September 2017, Raptor engines had been tested for a combined total of 1,200 seconds of test firing time over 42 main engine tests. The longest test was 100 seconds, which was limited by the size of the propellant tanks at the SpaceX ground test facility. The test engine operates at 20 MPa (200 bar; 2,900 psi) pressure. The flight engine is aimed for 25 MPa (250 bar; 3,600 psi), and SpaceX expects to achieve 30 MPa (300 bar; 4,400 psi) in later iterations.[41] In November 2017, SpaceX president and COO Gwynne Shotwell indicated that approximately half of all development work on BFR was then focused on the Raptor engine.[45]

The aspirational goal in 2017 was to send the first two cargo missions to Mars in 2022,[42] with the goal to "confirm water resources and identify hazards" while deploying "power, mining, and life support infrastructure" in place for future flights, followed by four ships in 2024, two crewed BFR spaceships plus two cargo-only ships bringing additional equipment and supplies with the goal of setting up the propellant production plant.[41]

By early 2018, the first ship using carbon composite structure was under construction, and SpaceX had begun building a new permanent production facility to build the 9-meter vehicles at the Port of Los Angeles. Manufacture of the first ship was underway by March 2018 in a temporary facility at the port,[46] with first suborbital test flights planned for no earlier than 2019.[46][47] The company continued to state publicly its aspirational goal for initial Mars-bound cargo flights of BFR launching as early as 2022, followed by the first crewed flight to Mars one synodic period later, in 2024,[46][43] consistent with the no-earlier-than dates mentioned in late-2017.

Back in 2015, SpaceX had been scouting for manufacturing facility locations to build the large rocket, with locations being investigated in California, Texas, Louisiana,[48] and Florida.[49] By September 2017, SpaceX had already started building launch vehicle components: "The tooling for the main tanks has been ordered, the facility is being built, we will start construction of the first ship [in the second quarter of 2018.]"[41]

In March 2018, SpaceX announced that it would manufacture its next-generation, 9-meter-diameter (30 ft) launch vehicle and spaceship at a new facility the company is constructing in 2018–2019 on Seaside Drive at the Port of Los Angeles. The company had leased an 18-acre (7.3 ha) site for 10 years, with multiple renewals possible, and will use the site for manufacturing, recovery from shipborne landings, and refurbishment of both the booster and the spaceship.[50][51][52] Final regulatory approval of the new manufacturing facility came from the Board of Harbor Commissioners in April 2018,[48] and the Los Angeles City Council in May.[53] By that time, approximately 40 SpaceX employees were working on the design and construction of BFR.[48] Over time, the project was expected to have 700 technical jobs.[49] The permanent Port of Los Angeles facility was projected to be a 203,500-square-foot (18,910 m2) building that would be 105 feet (32 m) tall.[54] The fully assembled launch vehicle was expected at that time to be transported by barge, through the Panama Canal, to Cape Canaveral in Florida for launch.[48]

In August 2018, for the first time, the US military publicly discussed interest in using the BFR. The head of USAF Air Mobility Command was specifically interested in BFRs ability to move up to 150 t (330,000 lb) of cargo to anywhere in the world using the projected Earth-to-Earth capability in under 30 minutes, for "less than the cost of a C-5". They projected the large transport capability "could happen within the next five to 10 years."[55][56]

Starship and Super Heavy[edit]

2018 artist's concept of the Starship's former design following stage separation

In a September 2018 announcement of a planned 2023 lunar circumnavigation mission, a private flight called #dearMoon project,[57] Musk showed a redesigned concept for the BFR second stage and spaceship with three rear fins and two front canard fins added for atmospheric entry, replacing the previous delta wing and split flaps shown a year earlier. The revised BFR design was to use seven identically-sized Raptor engines in the second stage; the same engine model as would be used on the first stage. The second stage design had two small actuating canard fins near the nose of the ship, and three large fins at the base, two of which would actuate, with all three serving as landing legs.[58] The two major parts of the re-designed BFR were given descriptive names in November: "Starship" for the upper stage and "Super Heavy" for the booster stage, which Musk pointed out was "needed to escape Earth's deep gravity well (not needed for other planets or moons)."[59]

In May 2019, the final Starship design changed back to six Raptor engines, with three optimized for sea-level and three optimized for vacuum.[60] Also clarified was that the initial prototype Super Heavy will be full size,[61] but was subsequently clarified that it would make initial test flights with less than the full complement of engines, perhaps approximately 20.[62]

SpaceX began to refer to the entire two-stage-to-orbit, fully-reusable, super heavy-lift launch vehicle as the SpaceX Starship system in 2019,[2][1] although they also continue to use "Starship" to refer to only the spacecraft (second stage).[3][4]

As the Raptor engine design was iterated, and higher thrust versions tested well on the test stand, the number of engines in the Super Heavy booster stage changed. Super Heavy was initially announced to have as many as 37 Raptor engines on the first stage, and a design with 31 engines was the public plan as late as May 2020.[63] However, in August 2020, Musk stated that the design had changed: "It might be 28 engines," as a result of engine design changes including increased chamber pressure and a higher thrust-to-weight ratio. In August 2020, Elon Musk expected a Super Heavy prototype for September or October.[64] Musk clarified that SpaceX intends to fly hundreds of cargo flights with Starship before carrying human passengers.[5]

In February 2021 SpaceX completed raising an additional US$3.5 billion in equity financing over the previous six months,[65][66] to support the capital-intensive phase of Starship launch system development and the operational fielding of the Starlink satellite constellation.[65] In April, SpaceX clarified that they continue to expect the "point-to-point transportation between two locations on Earth" use case to be operational and flying "large numbers of people" within five years.[65]

Starship prototypes[edit]

Name First spotted Rolled out[a] First static fire Maiden flight Decommissioned Construction site Status Flights
Starhopper December 2018[67] 8 March 2019[68] 3 April 2019[69] 25 July 2019[70] August 2019[71] Boca Chica, Texas Retired[72][73] 2
Mk1 December 2018[74] 31 October 2019[75] N/A N/A 20 November 2019[76] Boca Chica, Texas Destroyed 0
Mk2 May 2019[77] N/A N/A N/A November 2019[78][79] Cocoa, Florida Scrapped 0
SN1[b] c. October 2019[81] 26 February 2020[82] N/A N/A 28 February 2020[83] Boca Chica, Texas Destroyed 0
Mk4 c. September 2019[81] N/A N/A N/A November 2019[78][84] Cocoa, Florida 0
SN3 March 2020 29 March 2020[85] N/A N/A 3 April 2020[86] Boca Chica, Texas Destroyed 0
SN4 April 2020[87][88] 24 April 2020[89] 5 May 2020[90] N/A 29 May 2020[91] Boca Chica, Texas Destroyed 0
SN5 April 2020[88] 24 June 2020[92] 27 July 2020[93] 4 August 2020[94] February 2021[95] Boca Chica, Texas Scrapped 1
SN6 May 2020[96][97] 12 August 2020[98] 23 August 2020[99] 3 September 2020[100] January 2021[101][95] Boca Chica, Texas Scrapped 1
SN8 July 2020[102] 27 September 2020[103] 20 October 2020 9 December 2020[104] 9 December 2020[104] Boca Chica, Texas Destroyed 1
SN9 August 2020[105] 22 December 2020[106] 6 January 2021[107] 2 February 2021[107] 2 February 2021[107] Boca Chica, Texas Destroyed 1
SN10 September 2020[108] 29 January 2021[109] 23 February 2021[110] 3 March 2021[111] 3 March 2021[111] Boca Chica, Texas Destroyed[c] 1
SN11 September 2020[112] 8 March 2021[113] 22 March 2021[114] 30 March 2021[115] 30 March 2021 Boca Chica, Texas Destroyed 1
SN12 September 2020[116] N/A N/A N/A February 2021[117] Boca Chica, Texas Suspended[d][117] 0
SN13 October 2020[120] N/A N/A N/A February 2021[117] Boca Chica, Texas Suspended[117] 0
SN14 October 2020[121] N/A N/A N/A February 2021[117] Boca Chica, Texas Suspended[117] 0
SN15 November 2020[122] 8 April 2021[123] 26 April 2021[124][125] 5 May 2021[126] Not yet[e][127] Boca Chica, Texas On landing pad[128] 1
SN16 December 2020[129] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[130] 0
SN17 December 2020[131] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[117] 0
SN18 January 2021[132] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[117] 0
SN19 February 2021[133] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[133] 0
SN20 March 2021[134] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[134] 0
  1. ^ moved from build site to launch site
  2. ^ Originally designated Mk3, renamed SN1 in November 2019 after the failure of Mk1.[80]
  3. ^ Landed successfully after 10 km test flight, but exploded during vehicle safing procedures on landing pad
  4. ^ Never completed as flight vehicle. Repurposed as a structural testing unit in March 2021[118][119]
  5. ^ Dates marked in beige represent future events, and are no-earlier-than dates.

Starhopper[edit]

Starhopper
Starhopper configuration as flown in August 2019

On 8 December 2018, nine months after starting construction of some parts of the first test article carbon composite Starship low-altitude test vehicle, Musk announced a "counter-intuitive new design approach" would be taken by the company: the primary construction material for the rocket's structure and propellant tanks would be "fairly heavy...but extremely strong" metal,[135][136][137] subsequently revealed to be stainless steel.[138] Musk revealed on 23 December 2018 that the initial test article—the Starship Hopper,[139] Hopper, or Starhopper[140][141]— had been under construction there for several weeks, out in the open on SpaceX property. The Starhopper was being built from a 300-series stainless steel. According to Musk, the reason for using this material is that "it's [stainless steel] obviously cheap, it’s obviously fast—but it's not obviously the lightest. But it is actually the lightest. If you look at the properties of a high-quality stainless steel, the thing that isn’t obvious is that at cryogenic temperatures, the strength is boosted by 50 percent."[142] The high melting point of 300-series still would mean the leeward side of Starship would need no insulation during reentry, while the much hotter windward side would be cooled by allowing fuel or water to bleed through micropores in a double-wall stainless steel skin, removing heat by evaporation. The Starhopper had a single engine and was used for a test flight to develop the landing and low-altitude/low-velocity control algorithms.

From mid-January to early-March 2019, a major focus of the manufacture of the test article was to complete the pressure vessel construction for the liquid methane and liquid oxygen tanks, including plumbing up the system, and moving the lower tank section of the vehicle 3.2 km (2.0 mi) to the launch pad on 8 March 2019.[68] Integrated system testing of the Starhopper—with the newly built ground support equipment (GSE) at the SpaceX South Texas facilities—began in March 2019. "These tests involved fueling Starhopper with LOX and liquid methane and testing the pressurization systems, observed via icing of propellant lines leading to the vehicle and the venting of cryogenic boil off at the launch/test site. During a period of over a week, Starhopper underwent almost daily tanking tests, wet dress rehearsals and a few pre-burner tests."[143] In early 2019, a storm impacted the Texas site, blowing over the top nose cone of Starhopper and damaging it. It was thought that a rebuilt of the nose cone was required; however, in the end SpaceX decided to forgo the use of a nose cone altogether and use the Starhopper vehicle without a nose cone.[143]

Following initial integrated system testing of the Starhopper test vehicle with Raptor engine serial number 2 (Raptor SN2) in early April 2019, the engine was removed for post-test analysis and several additions were made to the Starhopper. Attitude control system thrusters were added to the vehicle, along with shock absorbers for the non-retractable landing legs, and quick-disconnect connections for umbilicals. Raptor SN4 was installed in early June for fit checks, but the first test flight that is not tethered was expected to fly with Raptor SN5,[144] until it suffered damage during testing at SpaceX Rocket Development and Test Facility, in McGregor, Texas. Subsequently, Raptor SN6 was the engine used by Starhopper for its untethered flights.[145]

On 3 April 2019, SpaceX conducted a successful static fire test in Texas of its Starhopper vehicle, which ignited the engine while the vehicle remained tethered to the ground.[146] The firing was a few seconds in duration, and was classed as successful by SpaceX. This was the first firing of Starhopper, the first firing of a rocket engine in the Texas launch site and the first tethered hop/flight (according to Musk[147][143]) in the Starship programme. The vehicle might have lifted off the ground, but this would have only been to the height of few inches, and it is not possible to see the lift off in public video recordings of the test.[143] A second tethered test followed just two days later, on 5 April 2019. This time the vehicle rose off the ground to hit tether limit of about 1 metre altitude.[148][149][143]

By May 2019, SpaceX was planning to conduct flight tests both in South Texas and on the Florida space coast.[150][151][144] The FAA issued a one-year experimental permit in June 2019 to fly Starhopper at Boca Chica, including pre-flight and post-flight ground operations.[152] By late May 2019, while the Starhopper was preparing for untethered flight tests in South Texas, they were building two high-altitude prototypes simultaneously, Mk1 in Texas and Mk2 in Florida. The two ships were constructed by competing teams—that were required to share progress, insights, and build techniques with the other team, but neither team is required to use the other team's techniques.[150][151][148] The larger Mk1 and Mk2 test vehicles featured three Raptor methalox engines meant to reach an altitude of no more than 5 km (3.1 mi), and the initial flight was expected no earlier than the first half of 2019.[153][154] Construction of a Mk3 prototype began in late-2019. A first orbital flight was not expected until Mk4 or Mk5 in mid 2020.[155] The build of the first Super Heavy booster stage was projected to be able to start by September.[151] At the time, neither of the two orbital prototypes yet had aerodynamic control surfaces nor landing legs added to the under construction tank structures, and Musk indicated that the design for both would be changing once again.[156] On 21 September 2019, the externally-visible "moving fins"[157] began to be added to the Mk1 prototype, giving a view into the promised mid-2019 redesign of the aerodynamic control surfaces for the test vehicles.[158][159]

On 25 July 2019, the Starhopper made its initial flight test, a "hop" of approximately 20 m (66 ft) altitude,[160] and a second and final "hop" on 27 August, reaching an altitude of approximately 150 m (490 ft)[161] and landing approximately 100 m (110 yd) from the launchpad, demonstrating the first use of the Raptor engine in real flight. Starhopper remains situated next to launch area.

Mk1, Mk2, Mk3, Mk4[edit]

Starship Mk1

Mk1 and Mk2 were early prototypes of the final design for Starship. SpaceX completed the external structure of the Starship Mk1 in time for Musk's public update in September 2019. Watching the construction in progress before the event, observers circulated photos online and speculated about the most visible changes, including a move to two tail fins from the earlier three. During the event, Musk added that landing would now be accomplished on six dedicated landing legs, following a re-entry protected by ceramic heat tiles.[162] Updated specifications were provided: when optimized, Starship was expected to mass at 120,000 kg (260,000 lb) empty and be able to initially transport a payload of 100,000 kg (220,000 lb) with an objective of growing that to 150,000 kg (330,000 lb) over time. Musk suggested that an orbital flight might be achieved by the fourth or fifth test prototype in 2020, using a Super Heavy booster in a two-stage-to-orbit launch vehicle configuration,[163][164] and emphasis was placed on possible future lunar missions.[165]

In September 2019, Elon Musk unveiled Starship Mk1,[166][167] and on 20 November 2019, the Mk1 test article came apart in a tank pressure test in Texas.[168][169] Mk2 was never completed. The same day, SpaceX stated they would stop developing Mk1 and Mk2 and move on to work on the Mk3 and Mk4 articles.[78][79][170] Construction began on the Starship Mk4 in Florida by mid-October 2019.[171] A few weeks later, the work on the vehicles in Florida paused, with eventual cancellation of Mk4. Some assemblies that had been built in Florida were transported to the Texas assembly location in Boca Chica; there was reportedly an 80% reduction in the workforce at the Florida assembly location as SpaceX paused activities there.[78] SpaceX's Starship development work was now focused on the Texas site.

The Mark 1 was 9 m (30 ft) diameter by approximately 50 m (160 ft) tall[155] It had an empty mass of 200 t (220 short tons); 1,400 t (1,400 long tons; 1,500 short tons) with propellant loaded[172] The Mark 1 prototype test articles for engineering extension of the rocket's powered flight and atmospheric reentry flight envelope, to higher altitudes (>200 meters) and velocities than the two test flights of the Starhopper in summer 2019. The test methodology is vertical-takeoff and vertical-landing suborbital spaceflight. One of many engineering objectives of the early test flights is to recover the test vehicle so that the vehicle can continue to be used on subsequent test flights to further extend the flight envelope. This is a test regime frequently seen with new aircraft, but has rarely been done with orbital spacecraft (the Space Shuttle is an exception), and has never been done on a launch vehicle second stage on powered test flights into the upper atmosphere. Propulsion by three Raptor methalox engines; may test with up to six engines later in the flight test program[159] For in-atmosphere Attitude control[173] it has two front actuated fins[174] and two rear actuated fins[157] (also referred to as "moveable fins"[174]). Stability control is via rapid movement of both rear and forward fins during entry and landing, with Vernier force control from the attitude control system thrusters.[175] The control surfaces are actuated by "many powerful electric motors and batteries"[176] The Mk1 used four Tesla 100 kWh (360 MJ) Lithium-ion battery packs and Tesla Model 3 motors to provide electrohydraulic actuation of the control surfaces. Musk is interested in iterating this to electromechanical actuation in subsequent versions (approximately Mk3) to eliminate the hydraulic accumulator and related inefficiencies.[177] For out-of-atmosphere or upper atmosphere it uses cold gas nitrogen reaction control system (RCS) thrusters only. The nose cone contains header tanks for landing, batteries, mounting and reaction control for the front movable fins[159][174]

Starship SN1 (Mk3)[edit]

In December 2019, Musk announced that the Starship Mk3 would be redesignated "Starship SN1" and there would be at least minor design improvements at least through Starship SN20.[80] Musk also explained that there was a change in the production of Starship. Some parts are now stamped and TIP TIG welded vs bump-formed and flux core welded. The new production process guarantees stronger joints and a mass reduction of 20%.[178]

In January 2020, SpaceX performed pressurization tests on two test article tanks in Boca Chica.[179] One such test took place on 10 January 2020, when a test tank was intentionally destroyed by over-pressurizing it; the tank achieved pressure of 7.1 bar (710 kPa).[180] Later, another test tank underwent at least two pressurization tests; in the first experiment, on Monday 27 January 2020, the test tank withstood a pressure of 7.5 bar (750 kPa)[181] before springing a leak. The leak was welded and the tank subjected to cryogenic pressure test on 28 January 2020, when the tank was intentionally pressurized until it ruptured and was destroyed at the pressure of 8.5 bar (850 kPa)[182] The test was however considered a success despite the destruction of the tank, as the pressure reached 8.5 bar (850 kPa), the pressure the tank needed to hold to be considered safe for human spaceflight; that is, the tank demonstrated a safety factor of 1.4 (1.4 times the operational pressure).[183][184]

Starship SN1 (originally known as Starship Mk3) was stated to be "designed for orbit" according to SpaceX. Later on, it was unclear whether this was the case (that SN1 would fly to orbit), and whether Starship SN1 would be used only for static fire testing (with one or more Raptor engines installed) and perhaps for one or more suborbital flights taking the vehicle to a 20 kilometer altitude with a soft landing back to Boca Chica.[185]

SpaceX began construction of internal components for the vehicle in December 2019, and started stacking SN1 at Boca Chica two months later.[185][186]

SpaceX began stacking SN1 in February 2020 after a series of pressurization tests on propellant tank prototypes. The weld quality of the rings had been improved[185] but SN1 failed a cryogenic pressurization test on 28 February 2020 due to a design failure in the lower tank thrust structure[187] and the test article was destroyed. The structure ruptured from the bottom up, with most of the top part sent flying in the air and crashing into ground. At the time of the rupture, the SN1 vehicle had no nose cone, flight control structures, or Raptor engines installed, and was positioned on a test stand. The loss of SN1 was similar to the loss of Starship Mk1 in November 2019, leaving little of the vehicle intact. There were no injuries.[188]

Starship SN3, SN4[edit]

Static fire of SN4.

In March 2020, Musk discussed SpaceX's future plans for Starship prototype tests. Starship SN3 was planned to be used for static fire tests and short hops, while SN4 will be used for longer flights.[187]

Starship SN3 was destroyed during testing on 3 April 2020.[189][86] The cause of the failure was a testing configuration error.[190] The liquid oxygen tanks housed in the lower part of the prototype were pressurised with nitrogen in order to keep them pressurised and structurally capable of withstanding the weight of the full methane tanks undergoing testing. A valve was inadvertently commanded to open resulting in pressure loss and structural failure as the lower portion of the prototype crumbled under the weight of the heavy methane tanks.[190] SN4 was built reusing parts of SN3 not damaged during the mishap.[191]

Starship SN4 passed cryogenic pressure testing on 26 April 2020, making it the first prototype since the smaller SN2 test tank to do so.[192] On 5 and 7 May 2020, SN4 passed two static fires: One using the main tanks, while the other used the fuel header tank.[193] Three nights later after uninstalling the engine, a new cryogenic pressure test was conducted. On 19 May 2020 during the third test firing of the engine, vibrations shook loose the methane fuel piping in the engine causing a leak which ignited and spread to flammable insulation, the fire caused significant damage to the base of the rocket and destroyed the control wiring leaving SpaceX unable to command the depressurization of the fuel tanks for two days.[194] SN4 was destroyed on 29 May 2020 after a successful static fire test of its single Raptor engine, due to a failure with the Ground Support Equipment's quick-disconnect function.[195]

Starship SN5, SN6[edit]

SN5 during its 150m test flight.

In March 2020, Musk had set "an aspirational goal" of using SN5 or SN6 to conduct an orbital flight of Starship before the end of 2020.[196] After a successful static fire test on 30 July 2020,[197] SN5 completed a 150-meter flight on 4 August 2020 with a single Raptor engine, SN27.[94][198] After the success of SN5, SN6 completed a static fire on 24 August 2020. On 3 September, Starship SN6 was tested in a 150-meter hop test flight with a single Raptor engine, SN29.

In February 2021, SN5 began to be scrapped.[199] SN6 was scrapped in January 2021.[200]

Starship SN8[edit]

SN8 shortly after taking off during its test flight

In July 2020, Starship SN8 was planned to be built out of 304L stainless steel.[201] However it is believed there were still some parts made of 301 steel.[202] It was the first proof-of-principle prototype to include a nose cone fairing, aerodynamic control surfaces, and three Raptor engines. In late November, Musk gave the odds of SN8 landing in one piece at a third.[203] The body flaps[204] and nosecone with front flaps were installed at the pad after the first static fire.[205] In early October, SN8 conducted three cryogenic proof tests.[206] In late October and November, SpaceX conducted four static fires with the vehicle. During the third one, on 12 November 2020, debris from the pad caused the vehicle to lose pneumatics.[206] On 3 December 2020, SpaceX had lowered the altitude of a planned 15 km (9.3 mi) flight to 12.5 km (7.8 mi).[207] The flight was postponed from 8 to 9 December due to a "Raptor auto-abort". The launch took place on 9 December 2020 at 22:45 UTC. Launch, ascent, reorientation, and controlled descent were successful, but due to an unplanned drop in pressure of a header tank,[208] SN8 landed at a higher speed than intended and exploded.[209]

Starship SN9[edit]

SN9 on Suborbital Pad B, with the production facility in the background.

On 11 December 2020[clarification needed] the stand beneath the fully-built SN9 deformed causing the vehicle to tip and contact the walls inside the High Bay.[210] SN9 was subsequently secured vertical again on 14 December 2020, revealing damage to one of its canard fins. On 20 December 2020, a new forward flap replaced the damaged flap on SN9.[211] SN9 rolled out to the launch site and was mounted onto Suborbital Pad B on 22 December 2020, followed by a cryogenic proof test.[212][106] It underwent final integration operations over the Christmas holiday and began system tests on the launch stand on 28 December 2020.[213] SN9 conducted 6 static fires in total, all in the month of January.[107] On 13 January 2021, SN9 underwent three separate static fires, just hours apart.[214] After some issues detected, it was decided to swap out two of its Raptor engines, engines 44 and 46.[215] After struggling to gain permission from the FAA to launch,[216] SN9 conducted a 10 km (6.2 mi) flight test on 2 February 2021. Similar to SN8, the ascent, engine cutoffs, reorientation and controlled descent were all stable, but during the landing, only one Raptor engine fired, causing the vehicle to lose control and crash into the landing pad.[217] After this, the landing pad was reinforced with an additional layer of concrete.[218]

Starship SN10[edit]

On 29 January 2021, SN10 was moved to the launch site on suborbital pad A, concurrently with SN9.[109] As such, SN10 was present when SN9 crashed, but was not damaged. After the failure of SN9 due to a Raptor engine ignition issue, Musk stated that future missions would light all three Raptors to perform the belly flop landing sequence, instead of only two. This acts as a failsafe in the case that one engine fails to ignite.[219][117] SN10's first cryogenic proof test occurred on 8 February, with a static fire following on 23 February.[110] After an engine was swapped out, another static fire occurred on 25 February.[220] On 13 February, Musk gave the probability of a successful landing as being about 60%.[221]

Two launch attempts were conducted on 3 March. The first launch attempt at 20:14 UTC was automatically aborted after a single Raptor engine produced too much thrust while throttling up.The expected launch was delayed by 3 hours after increasing the tolerance.[222] The day's second attempt resulted in a successful launch with ascent, engine cutoffs, flip maneuver, descent, flap control, and landing burn. After following the same flight profile as SN8 and SN9, SN10 became the first Starship prototype to land intact after a high-altitude test. However, the vehicle had a hard landing as it impacted the landing pad at 10 m/s, most likely due to partial helium ingestion from the fuel header tank. SN10 failed to deploy all of its landing legs during the landing burn causing a slight lean after landing. Although the vehicle remained intact upon landing, the impact crushed the legs and part of the leg skirt. The prototype exploded 8 minutes after landing due to a suspected methane leak.[223][224]

Starship SN11[edit]

SN11 was moved to Suborbital Pad B on March 8th 2021 to begin its testing campaign.[225] On March 12th 2021, SN11 successfully underwent a cryogenic proof test also including testing of the RCS (Reaction Control System).[226][227] On March 15th 2021, SN11 attempted a static fire test. However, immediately after ignition of the Raptor engines, the test was aborted.[228] On 22 March 2021, a successful second first static fire attempt was at 8:56 am CDT.[229] On 25 March 2021, it was reported by Michael Baylor on Twitter that one of the three Raptor Engines on SN11 had been removed for repairs.[230] Later on in the morning, a replacement Raptor engine AKA Raptor 46 arrived to the launch site and was installed on SN11 on 6:06am CDT time.[231] Michael Baylor also reported on 25 March 2021 that another Static Fire test may take place on 26 March 2021 along with a 10km (6.8mi) High Altitude flight test.[232] On March 26th 2021, a third static fire was attempted at 8:09 am CDT, using at least raptor engine 46, seeming to last a normal duration.[233] A 10km (33,000ft) High Altitude flight test was conducted in heavy fog on 30 March 2021. The flight saw successful engine cutoffs, flip manoeuver, flap control and descent, however according to Elon Musk one of the Raptor engines had issues during ascent and did not reach operating chamber pressure.[234] Just after the landing burn started, SN11 lost telemetry at T+ 5:49 and experienced a disintegration. SN11 was then seen visually impacting the ground in multiple pieces shortly after the failure.[235] Elon Musk tweeted that a (relatively) small methane leak led to fire on engine 2 & fried part of avionics, causing hard start attempting landing burn in CH4 turbopump.[236]

Starship SN12, SN13, SN14[edit]

Many of the components of SN12 were assembled and partially stacked. During January and February 2021, parts of SN12 were scrapped.[237] In March 2021, the nose cone and other components of SN12 were repurposed for a structural testing unit.

Few parts were made for SN13 and SN14, and SpaceX did not complete the two prototypes.[117]

Starship SN15[edit]

Elon Musk referenced major upgrades to the design for SN15 and later prototypes.[238] These include an improved avionics software suite, an updated aft skirt propellant architecture, and a new Raptor engine design and configuration.[239] A Starlink antenna on the side of the vehicle has been identified as a new feature.[240]

Four days before rollout on 4 April 2021, a thrust simulator was installed on Suborbital Pad A to test new thrust puck design of SN15 before Raptor installation.[241] On 8 April 2021, SN15 was moved to the launch site where it was later mounted on Suborbital Pad A.[242][243] On 9 April 2021, SN15 successfully underwent an ambient temperature pressure test.[244] A cryogenic proof test of SN15 was conducted on 12 April 2021, and a header tank cryogenic proof test was conducted on 13 April 2021.[245] [242] The tests could have possibly made use of the thrust simulator installed on Suborbital Pad A.[246] On 14 April 2021, the thrust simulator attached to SN15 and Suborbital Pad A was removed.[247] A static fire was conducted on 26 April 2021,[124][125] and a header tank static fire was conducted on 27 April 2021.[248] A 10 km (33,000 ft) high-altitude flight test was successfully conducted in heavy cloud on 5 May 2021. The launch saw successful ascent, engine cutoffs, flip maneuver, flap control and soft touchdown. A small fire near the base occurred shortly after landing, but was later extinguished.[249] Elon Musk tweeted that SN15 may fly a second time.

Future prototypes[edit]

As of May 2021, Starship prototypes SN17 through SN20 are currently under construction, with SN16 constructed.

SN16 is currently fully stacked inside the High-Bay.[130]

SN17 currently has several components prepped such as the Common Dome and Mid-LOX sections.[250]

A few subassemblies for SN20 have been spotted after 7 March 2021.[134][251][252][non-tertiary source needed] NASASpaceflight announced via Twitter on 15 March 2021, that SN20 may fly atop of the currently under construction Super-Heavy BN3 prototype as part of the first Starship Orbital Flight Test.[253]

Test tanks[edit]

Name First spotted Rolled out Decommissioned Construction site Status
TT1 January 2020[254] 9 January 2020[255] 10 January 2020[256] Boca Chica, Texas Intentionally destroyed[256]
LOX HTT January 2020[257] 23 January 2020[257] 25 January 2020[258] Boca Chica, Texas Intentionally destroyed[258]
TT2 January 2020[259] 27 January 2020[260] 28 January 2020[261] Boca Chica, Texas Intentionally destroyed[261]
SN2 February 2020[262] 7 March 2020[263] March 2020[264] Boca Chica, Texas Retired[264]
SN7 May 2020[265] 12 June 2020[266] 23 June 2020[267] Boca Chica, Texas Intentionally destroyed[267]
SN7.1 July 2020[201] 8 September 2020[268] 22 September 2020[269] Boca Chica, Texas Intentionally destroyed[269]
SN7.2 December 2020[270] 20 January 2021[271] Un­known Boca Chica, Texas At production site[a]
  1. ^ Unclear whether SN7.2 will be repaired for more tests or scrapped.[272]

TT1, LOX HTT, and TT2[edit]

The Test Tank 1, abbreviated as TT1, was a subscale test tank consisting of two forward bulkheads connected by a small barrel section. TT1 was used to test new materials and construction methods. On 10 January 2020, TT1 was tested to failure as part of an ambient temperature test reaching a pressure of 7.1 bar (710 kPa) before bursting.[256]

The Liquid Oxygen Header Test Tank, known as LOX HTT, was similar to TT1, but this time based on the LOX Header tank inside a nosecone section. On 24 January 2020, the tank successfully underwent a pressurization test which lasted several hours.[273] The following day it was tested to destruction.[258]

The Test Tank 2, abbreviated as TT2, was another subscale test tank similar to TT1. It consisted of two forward bulkheads connected by a small barrel section just like TT1. On 27 January 2020, TT2 underwent an ambient temperature pressure test where it reached a pressure of 7.5 bar (750 kPa) before a leak occurred.[181] Two days later, it underwent a cryogenic proof test to destruction, and burst at 8.5 bar.[274][261]

SN2[edit]

The SN2 test article was a half-size test tank used to test welding quality and thrust puck design. The thrust puck is found on the bottom of the vehicle where in later Starship tests up to three sea-level Raptor engines would be mounted. SN2 passed the pressure test on 8 March 2020.[188][275]

SN7, SN7.1, and SN7.2[edit]

SN7 was a pathfinder test article for the SpaceX manufacturing process to switch to type 304L stainless steel from the type 301 stainless steel used for the earlier prototypes.[201] A cryogenic proof test was performed in June 2020, where it achieved pressure of 7.6 bar (760 kPa) before leaking. After repairs, the tank was tested to destruction on 23 June 2020, after reaching an unknown pressure.[276][267]

SN7.1 was the second 304L test tank, with the goal of reaching a higher failure pressure than they achieved with SN7.[201] The tank was tested several times in September, and tested to destruction on 23 September 2020.[277] The tank burst at a pressure of 8 bar (800 kPa) near the top of the tank where the tank metal separated.[278][269]

SN7.2 was another test tank, this time with the intention of testing a design with thinner walls. It is believed to be constructed from 3 mm steel sheets rather than the 4 mm thickness of its predecessors.[279] On 26 January 2021, SN7.2 passed a cryogenic proof test. On 4 February 2021, during a pressurize to failure test, the tank developed a leak, which was repaired by workers throughout the days.[280][117] On 15 March 2021, SN7.2 was rolled back to the production site.[281] The fate for SN7.2’s future is currently unknown.[272]

Super Heavy booster prototypes[edit]

Name First spotted Rolled out First static fire Maiden flight Decommissioned Construction site Status Flights
BN1[282] September 2020[283] N/A[284] N/A[284] N/A[284] 30 March 2021[284] Boca Chica, Texas Scrapped[285][286] 0
BN2 January 2021[132] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[117] 0
BN3 March 2021[287] Not yet Not yet Not yet Not yet Boca Chica, Texas Under construction[288][289] 0

Booster BN1[edit]

BN1 was the first Super-Heavy Booster prototype, designed to be a pathfinder and not intended to be flight-tested.[290] Sections of the ~70 m (230 ft) tall test article were manufactured throughout the fall, and stacking of the first prototype began in December 2020, inside the incomplete high bay building.[213] BN1 was fully stacked inside the high bay on 18 March 2021.[291] On 30 March 2021, Elon Musk stated that BN1 would be scrapped in favour of BN2 and will not roll out to the launch site and perform testing.[284] On 13 April 2021, the scrapping of BN1 commenced.[285]

Booster BN2[edit]

Super Heavy BN2 is in production as of May 2021. Elon Musk stated that BN2 "might even be orbit-capable if we are lucky".[284] As of April 2021, the Forward Dome and Aft Dome tank subassemblies have been spotted.[292][293][294]

Booster BN3[edit]

NASASpaceFlight reported on 15 March 2021, that the Super-Heavy BN3 prototype may fly with the currently-under-construction Starship SN20 as part of the first Starship Orbital Flight Test.[253] As of April 2021, the Forward Dome, Common Dome, and two Aft Tank sections have been prepped.[295][296][297][298][252][non-tertiary source needed]

Starship test flights[edit]

Seven prototype Starship vehicles, each with different vehicle configurations, have flown nine suborbital test flights in the period July 2019 to May 2021. SpaceX testing is proprietary, and the company does not release a detailed set of test objectives for their vehicle development test flights. All test flights have been launched from the SpaceX South Texas launch site at Boca Chica, South Texas.[299]

Flight
No.
Date and time
(UTC)
Vehicle Launch site[i] Flight apogee Duration
- 3 April 2019 Starhopper Launch site ~0.2 m (1 ft) ~3 seconds
The first firing of Starhopper and the first tethered hop (according to Musk[300][143]). The firing was a few seconds in duration and the vehicle was tethered to the ground. The vehicle might have lifted off the ground, but only to the height of few inches, and it was not possible to see the lift off in public video recordings of the test.[143][301]
- 5 April 2019 Starhopper Launch site ~1 m (3 ft) ~5 seconds
Tethered hop which hit tether limits. Used a single Raptor SN2 engine.[144]
1 25 July 2019[302] Starhopper Launch site 20 m (66 ft)[303] ~22 seconds
First free (untethered) flight test. Single Raptor engine, SN6.
2 27 August 2019 22:00[304][305] Starhopper Launch site 150 m (490 ft)[304] ~1 minute[306]
Single Raptor engine, SN6. Starhopper was retired after this launch, with some parts being reused for other tests.[304][307][308]
3 4 August 2020 23:57[309][310] Starship SN5 Suborbital Pad A 150 m (490 ft)[309] ~45 seconds
Single Raptor engine, SN27.[311] A successful 150-meter flight was completed on 4 August 2020.[312]
4 3 September 2020 17:47[313] Starship SN6 Suborbital Pad A 150 m (490 ft)[314] ~45 seconds
Single Raptor engine, SN29.[313] A successful test hop took place on 3 September 2020.[313]
5 9 December 2020[315] 22:45 Starship SN8 Suborbital Pad A 12.5 km (41,000 ft)[316] 6 minutes, 42 seconds
Three Raptor engines, SN30, SN36, and SN42.[317] The vehicle successfully launched, ascended, performed the skydive descent maneuver, relit the engines fueled by the header tanks, and steered to the landing pad.[316] The flip maneuver from horizontal descent to vertical was successful. Low pressure in the fuel header tank as a result of the flip maneuver caused engine issues and insufficient retropropulsive deceleration, resulting in a hard landing and destruction of SN8.[316]
6 2 February 2021[318] 20:25 Starship SN9 Suborbital Pad B 10 km (33,000 ft)[319][318][320] 6 minutes, 26 seconds[320]
Three Raptor engines, including SN45 and SN49.[320][321][322][323] A hard landing destroyed SN9.[324] The cause of the crash was one of the engines not relighting due to an issue with the oxygen preburner.
7 3 March 2021[325][326] 23:15 Starship SN10 Suborbital Pad A 10 km (33,000 ft)[327] 6 minutes, 24 seconds[328][ii]
SN10 experienced a hard landing with a slight lean and a fire near the base,[331] and then exploded eight minutes after landing.[undue weight? ][327] The thrust was too low causing the legs & part of the skirt to get crushed. The cause was probably due to partial helium ingestion from the fuel header tank.[329]
8 30 March 2021 13:00[332] Starship SN11 Suborbital Pad B 10 km (33,000 ft)[333] ~6 minutes[332]
SN11 launched in heavy fog, and had engine issues during ascent according to Elon Musk.[334] Telemetry was lost midair at T+5:49, shortly after engine re-ignition to perform landing procedures.[335][failed verification] Debris was then seen impacting the ground.[336] Elon Musk stated that a small methane leak caused a fire on one of the Raptor engines which then eventually fried the avionics of the Raptor.[337]
9 5 May 2021 22:24[338] Starship SN15 Suborbital Pad A 10 km (33,000 ft)[339] 5 minutes, 59 seconds
SN15 is a new iteration of prototype Starship with many upgrades over previous vehicles.[340] SN15 launched in light fog and achieved a soft landing with a fire near the base (similar to SN10) that was extinguished by the automatic fire suppression systems.[341][342][343][344]
10 TBD Starship SN15 TBD TBD TBD
As of 7 May, SpaceX is considering flying SN15 a second time.[345] This would be the first reflight of a Starship prototype since Starhopper.
  1. ^ All launches are from the same Boca Chica site. SpaceX started calling this Starbase from March 2021 after discussions called a "casual enquiry". See Boca Chica (Texas) § Starbase
  2. ^ Despite making an intact landing and beginning the detanking procedures, the vehicle suffered an explosion several minutes later destroying the vehicle in the process. SpaceX called it a successful landing but later acknowledged a problem with lower-than-expected engine thrust causing a hard landing[329] way past leg loads[330] and the vehicle exploded.[326]


See also[edit]

References[edit]

  1. ^ a b "Starship Users Guide, Revision 1.0, March 2020" (PDF). SpaceX. March 2020. Archived (PDF) from the original on 2 April 2020. Retrieved 18 May 2020. SpaceX's Starship system represents a fully reusable transportation system designed to service Earth orbit needs as well as missions to the Moon and Mars. This two-stage vehicle – composed of the Super Heavy rocket (booster) and Starship (spacecraft)
  2. ^ a b "Starship". SpaceX. Archived from the original on 30 September 2019. Retrieved 30 September 2019.
  3. ^ a b berger, Eric (5 March 2020). "Inside Elon Musk's plan to build one Starship a week and settle Mars". Ars Technica. Archived from the original on 5 March 2020. Retrieved 6 March 2020. Musk tackles the hardest engineering problems first. For Mars, there will be so many logistical things to make it all work, from power on the surface to scratching out a living to adapting to its extreme climate. But Musk believes that the initial, hardest step is building a reusable, orbital Starship to get people and tons of stuff to Mars. So he is focused on that.
  4. ^ a b Berger, Eric (29 September 2019). "Elon Musk, Man of Steel, reveals his stainless Starship". Ars Technica. Archived from the original on 28 December 2019. Retrieved 30 September 2019.
  5. ^ a b Sheetz, Michael (1 September 2020). "Elon Musk says SpaceX's Starship rocket will launch "hundreds of missions" before flying people". CNBC. Archived from the original on 2 September 2020. Retrieved 7 February 2021. CS1 maint: discouraged parameter (link)
  6. ^ Lawler, Richard (20 November 2018). "SpaceX BFR has a new name: Starship". Engadget. Retrieved 21 November 2018.
  7. ^ Sheetz, Michael (7 June 2020). "Elon Musk tells SpaceX employees that its Starship rocket is the top priority now". CNBC. Retrieved 9 June 2020.
  8. ^ a b c d e "Huge Mars Colony Eyed by SpaceX Founder". Discovery News. 13 December 2012. Archived from the original on 15 November 2014. Retrieved 25 September 2016.
  9. ^ a b c Belluscio, Alejandro G. (7 March 2014). "SpaceX advances drive for Mars rocket via Raptor power". NASASpaceFlight.com. Archived from the original on 11 September 2015. Retrieved 25 September 2016.
  10. ^ Hoffman, Carl (22 May 2007). "Elon Musk Is Betting His Fortune on a Mission Beyond Earth's Orbit". Wired Magazine. Archived from the original on 14 November 2012. Retrieved 14 March 2014.
  11. ^ a b "Elon Musk: I'll Put a Man on Mars in 10 Years". Market Watch. New York: The Wall Street Journal. 22 April 2011. Archived from the original on 1 December 2011. Retrieved 1 December 2011.
  12. ^ Carroll, Rory (17 July 2013). "Elon Musk's mission to Mars". TheGuardian. Archived from the original on 8 January 2014. Retrieved 25 September 2016.
  13. ^ Messier, Doug (5 February 2014). "Elon Musk Talks ISS Flights, Vladimir Putin and Mars". Parabolic Arc. Archived from the original on 16 September 2018. Retrieved 25 September 2016.
  14. ^ Zach Rosenberg (15 October 2012). "SpaceX aims big with massive new rocket". Flight Global. Archived from the original on 3 July 2015. Retrieved 25 September 2016.
  15. ^ Coppinger, Rod (23 November 2012). "Huge Mars Colony Eyed by SpaceX Founder Elon Musk". Space.com. Archived from the original on 28 June 2013. Retrieved 25 September 2016. an evolution of SpaceX's Falcon 9 booster ... much bigger [than Falcon 9], but I don’t think we’re quite ready to state the payload. We’ll speak about that next year. ... Vertical landing is an extremely important breakthrough — extreme, rapid reusability.
  16. ^ Schaefer, Steve (6 June 2013). "SpaceX IPO Cleared For Launch? Elon Musk Says Hold Your Horses". Forbes. Archived from the original on 6 March 2017. Retrieved 10 June 2013.
  17. ^ Ciaccia, Chris (6 June 2013). "SpaceX IPO: 'Possible in the Very Long Term'". The Street. Archived from the original on 10 June 2013. Retrieved 10 June 2013.
  18. ^ a b Heath, Chris (12 December 2015). "How Elon Musk Plans on Reinventing the World (and Mars)". GQ. Archived from the original on 12 December 2015. Retrieved 25 September 2016.
  19. ^ a b Nellis, Stephen (19 February 2014). "SpaceX's propulsion chief elevates crowd in Santa Barbara". Pacific Coast Business Times. Archived from the original on 26 September 2016. Retrieved 25 September 2016.
  20. ^ Bergin, Chris (29 August 2014). "Battle of the Heavyweight Rockets -- SLS could face Exploration Class rival". NASAspaceflight.com. Archived from the original on 16 March 2015. Retrieved 6 November 2016.
  21. ^ Boyle, Alan (5 January 2015). "Coming Soon From SpaceX's Elon Musk: How to Move to Mars". NBC News. Archived from the original on 8 January 2015. Retrieved 25 September 2016. The Mars transport system will be a completely new architecture. Am hoping to present that towards the end of this year. Good thing we didn't do it sooner, as we have learned a huge amount from Falcon and Dragon.
  22. ^ Boyle, Alan (27 January 2016). "SpaceX's Elon Musk wants to go into space by 2021 and start Mars missions by 2025". GeekWire. Archived from the original on 30 January 2016. Retrieved 25 September 2016.
  23. ^ a b Davenport, Christian (13 June 2016). "Elon Musk provides new details on his 'mind blowing' mission to Mars". Washington Post. Archived from the original on 7 February 2018. Retrieved 25 September 2016.
  24. ^ Boyle, Alan (10 June 2016). "SpaceX's Elon Musk teases 'dangerous' plan to colonize Mars starting in 2024". GeekWire. Archived from the original on 21 August 2016. Retrieved 10 August 2016.
  25. ^ Musk, Elon. "Elon Musk @andyzalk". Twitter. Archived from the original on 16 July 2018. Retrieved 21 September 2016.
  26. ^ Berger, Eric (18 September 2016). "Elon Musk scales up his ambitions, considering going "well beyond" Mars". Ars Technica. Archived from the original on 20 September 2016. Retrieved 19 September 2016.
  27. ^ a b Belluscio, Alejandro G. (3 October 2016). "ITS Propulsion – The evolution of the SpaceX Raptor engine". NASASpaceFlight.com. Archived from the original on 22 November 2018. Retrieved 3 October 2016.
  28. ^ 2016 StartmeupHK Venture Forum - Elon Musk on Entrepreneurship and Innovation. StartmeupHK Venture Forum--2016. via InvestHK YouTube channel: Invest Hong Kong. 26 January 2016. Archived from the original on 28 January 2016. Retrieved 28 January 2016. (SpaceX discussion at 30:15-31:40) We'll have the next generation rocket and spacecraft, beyond the Falcon and Dragon series ... I'm hoping to describe that architecture later this year at the International Astronautical Congress. which is the big international space event every year. ... first flights to Mars? we're hoping to do that in around 2025 ... nine years from now or thereabouts.
  29. ^ a b c Boyle, Alan (23 October 2016). "SpaceX's Elon Musk geeks out over Mars interplanetary transport plan on Reddit". GeekWire. Archived from the original on 24 October 2016. Retrieved 24 October 2016.
  30. ^ Mosher, Dave (17 November 2016). "The 'trickiest' part of Elon Musk's Mars spaceship -- a giant black orb -- just passed a critical test". Business Insider. Archived from the original on 17 November 2016. Retrieved 18 November 2016.
  31. ^ Elon Musk (19 July 2017). Elon Musk, ISS R&D Conference (video). ISS R&D Conference, Washington DC, USA. Event occurs at 49:48–51:35. Retrieved 13 September 2017 – via YouTube. the updated version of the Mars architecture: Because it has evolved quite a bit since that last talk. ... The key thing that I figured out is how do you pay for it? If we downsize the Mars vehicle, make it capable of doing Earth-orbit activity as well as Mars activity, maybe we can pay for it by using it for Earth-orbit activity. That is one of the key elements in the new architecture. It is similar to what was shown at IAC, but a little bit smaller. Still big, but this one has a shot at being real on the economic front.
  32. ^ Musk, Elon (17 September 2018). First Private Passenger on Lunar BFR Mission. SpaceX. Retrieved 18 September 2018 – via YouTube.
  33. ^ Bergin, Chris (11 May 2015). "Falcon Heavy enabler for Dragon solar system explorer". NASASpaceFlight.com. Archived from the original on 13 May 2015. Retrieved 12 May 2015.
  34. ^ a b c d e f g h Bergin, Chris (27 September 2016). "SpaceX reveals ITS Mars game changer via colonization plan". NASASpaceFlight.com. Archived from the original on 28 September 2016. Retrieved 27 September 2016.
  35. ^ a b c d e f g h i Richardson, Derek (27 September 2016). "Elon Musk Shows Off Interplanetary Transport System". Spaceflight Insider. Archived from the original on 1 October 2016. Retrieved 3 October 2016.
  36. ^ "Archived copy". Archived from the original on 27 September 2016. Retrieved 27 September 2016.CS1 maint: archived copy as title (link)
  37. ^ a b c d e "Making Humans a Multiplanetary Species" (PDF). SpaceX. 27 September 2016. Archived (PDF) from the original on 20 November 2017. Retrieved 10 November 2018.
  38. ^ Berger, Eric (28 September 2016). "Musk's Mars moment: Audacity, madness, brilliance—or maybe all three". Ars Technica. Archived from the original on 13 October 2016. Retrieved 13 October 2016.
  39. ^ Foust, Jeff (27 September 2016). "SpaceX's Mars plans call for massive 42-engine reusable rocket". SpaceNews. Retrieved 14 October 2016. Musk stated it’s possible that the first spaceship would be ready for tests in four years, with the booster ready a few years after that, but he shied away from exact schedules in his presentation. 'We’re kind of being intentionally fuzzy about the timeline,' he said. 'We’re going to try and make as much progress as we can with a very constrained budget.'
  40. ^ Elon Musk (27 September 2016). Making Humans a Multiplanetary Species (video). IAC67, Guadalajara, Mexico: SpaceX. Event occurs at 9:20–10:10. Archived from the original on 10 October 2016. Retrieved 10 October 2016. So it is a bit tricky. Because we have to figure out how to improve the cost of the trips to Mars by five million percent ... translates to an improvement of approximately 4 1/2 orders of magnitude. These are the key elements that are needed in order to achieve a 4 1/2 order of magnitude improvement. Most of the improvement would come from full reusability—somewhere between 2 and 2 1/2 orders of magnitude—and then the other 2 orders of magnitude would come from refilling in orbit, propellant production on Mars, and choosing the right propellant.CS1 maint: location (link)
  41. ^ a b c d e f g Elon Musk (29 September 2017). Becoming a Multiplanet Species (video). 68th annual meeting of the International Astronautical Congress in Adelaide, Australia: SpaceX. Retrieved 14 December 2017 – via YouTube.CS1 maint: location (link)
  42. ^ a b c d e f Musk, Elon (1 March 2018). "Making Life Multi-Planetary". New Space. 6 (1): 2–11. Bibcode:2018NewSp...6....2M. doi:10.1089/space.2018.29013.emu.
  43. ^ a b Jeff Foust (29 September 2017). "Musk unveils revised version of giant interplanetary launch system". SpaceNews. Retrieved 1 October 2017.
  44. ^ Jeff Foust (15 October 2017). "Musk offers more technical details on BFR system". SpaceNews. Retrieved 27 May 2019. [Musk] added that, since the presentation last month, SpaceX has revised the design of the BFR spaceship to add a "medium area ratio" Raptor engine to its original complement of two engines with sea-level nozzles and four with vacuum nozzles. That additional engine helps enable that engine-out capability ... and will "allow landings with higher payload mass for the Earth to Earth transport function."
  45. ^ Henry, Caleb (21 November 2017). "SpaceX aims to follow a banner year with an even faster 2018 launch cadence". SpaceNews. Retrieved 15 January 2018. Shotwell estimated that around 50 percent of the work on BFR is focused on the Raptor engines.
  46. ^ a b c Foust, Jeff (12 March 2018). "Musk reiterates plans for testing BFR". SpaceNews. Retrieved 15 March 2018. Construction of the first prototype spaceship is in progress. 'We're actually building that ship right now,' he said. 'I think we'll probably be able to do short flights, short sort of up-and-down flights, probably sometime in the first half of next year.'
  47. ^ Elon Musk (6 February 2018). 'Crazy things can come true': Elon Musk discusses Falcon Heavy launch: Full presser. Event occurs at 17:00. Archived from the original on 19 February 2019. Retrieved 22 March 2019 – via YouTube. If we get lucky, we'll be able to do short hopper flights with the spaceship part of BFR maybe next year.
  48. ^ a b c d Masunaga, Samantha (19 April 2018). "SpaceX gets approval to develop its BFR rocket and spaceship at Port of Los Angeles". Los Angeles Times. Archived from the original on 21 April 2018. Retrieved 21 April 2018.
  49. ^ a b Michael DiBernardo (19 April 2018). Port Authority of Los Angeles, Regular Board Meeting (video). LA: The Port of Los Angeles. Event occurs at 35:36. Archived from the original on 22 April 2018. Retrieved 21 April 2018 – via YouTube.
  50. ^ Berger, Eric (19 March 2018). "SpaceX indicates it will manufacture the BFR rocket in Los Angeles". Ars Technica. Archived from the original on 21 March 2018. Retrieved 21 March 2018.
  51. ^ "Fireside Chat with SpaceX President Gwynne Shotwell". Flickr.com. 11 October 2017. Archived from the original on 5 April 2019. Retrieved 7 March 2018.
  52. ^ Seemangal, Robin (1 February 2018). "SpaceX Gears Up to Finally, Actually Launch the Falcon Heavy". Wired. Archived from the original on 25 February 2018. Retrieved 7 March 2018. SpaceX is actively considering expanding its San Pedro, California facility to begin manufacturing its interplanetary spacecraft. This would allow SpaceX to easily shift personnel from headquarters in Hawthorne.
  53. ^ Masunaga, Samantha (8 May 2018). "All systems are go for SpaceX's BFR rocket facility at Port of Los Angeles after City Council OKs plan". Los Angeles Times. Archived from the original on 24 May 2018. Retrieved 24 May 2018.
  54. ^ "Regular Meeting, Planning & Strategy, Resolution" (PDF). Port of Los Angeles. Archived from the original (PDF) on 12 June 2018. Retrieved 6 June 2018.
  55. ^ Insinnia, Valerie (2 August 2018). "One possible job for SpaceX's BFR rocket? Taking the Air Force's cargo in and out of space". DefenseNews. Retrieved 9 June 2019.
  56. ^ Air Mobility Command Chief Looks Toward Supplying Forces From Space Archived 9 June 2019 at the Wayback Machine, US Department of Defense, 2 August 2018.
  57. ^ "Elon Musk Says SpaceX Will Send Yusaku Maezawa (and Artists!) to the Moon". Wired. 18 September 2018. Archived from the original on 16 July 2019. Retrieved 27 May 2019.
  58. ^ Eric Ralph (14 September 2018). "SpaceX has signed a private passenger for the first BFR launch around the Moon". Archived from the original on 14 September 2018. Retrieved 14 September 2018.
  59. ^ Boyle, Alan (19 November 2018). "Goodbye, BFR … hello, Starship: Elon Musk gives a classic name to his Mars spaceship". GeekWire. Archived from the original on 22 November 2018. Retrieved 22 November 2018. Starship is the spaceship/upper stage & Super Heavy is the rocket booster needed to escape Earth's deep gravity well (not needed for other planets or moons)
  60. ^ Elon Musk [@elonmusk] (23 May 2019). "3 sea level optimized Raptors, 3 vacuum optimized Raptors (big nozzle)" (Tweet) – via Twitter.
  61. ^ Musk, Elon [@elonmusk] (17 March 2019). "Full size" (Tweet) – via Twitter.
  62. ^ Musk, Elon [@elonmusk] (23 May 2019). "First flights would have fewer, so as to risk less loss of hardware. Probably around 20" (Tweet) – via Twitter.
  63. ^ "Elon Musk: Super Heavy will have 31 engines, not 37". Twitter. Retrieved 3 May 2020.
  64. ^ @elonmusk (27 August 2020). "Neuralink this month & Tesla next month, SpaceX probably October. We will have made a lot of progress by then. Might have a prototype booster hop done by then" (Tweet). Retrieved 23 September 2020 – via Twitter.
  65. ^ a b c Foust, Jeff (15 April 2021). "SpaceX adds to latest funding round". SpaceNews. Retrieved 15 April 2021. CS1 maint: discouraged parameter (link)
  66. ^ "Elon Musk's SpaceX raises $1.9 billion in funding". Reuters. Archived from the original on 20 August 2020. Retrieved 15 April 2021.
  67. ^ "SpaceX CEO Elon Musk teases new Starship photos and "heavy metal" BFR". 9 December 2018.
  68. ^ a b Ralph, Eric (9 March 2019). "SpaceX's Starship prototype moved to launch pad on new rocket transporter". Teslarati. Archived from the original on 6 January 2020. Retrieved 22 March 2019.
  69. ^ Berger, Eric (5 April 2019). "SpaceX's Starhopper vehicle test-fires its engine for the first time". arstechnica.
  70. ^ Wall, Mike (27 August 2019). "SpaceX Starhopper Rocket Prototype Aces Highest (and Final) Test Flight". space.com.
  71. ^ @elonmusk (20 August 2019). "Will be converted to Raptor vertical test stand" (Tweet) – via Twitter.
  72. ^ "SpaceX may 'cannibalize' its first Mars rocket-ship prototype in Elon Musk's race to launch Starship". 7 August 2019.
  73. ^ "Application for new or modified radio station under FCC rules". 4 June 2020.
  74. ^ @elonmusk (22 December 2018). "We're building subsections of the Starship Mk I orbital design there" (Tweet) – via Twitter.
  75. ^ "SpaceX Starship Mk1 Roll And Mounting at Launch Site". NASAspaceflight.com. 31 October 2019.
  76. ^ Berger, Eric (21 November 2019). "SpaceX has lost its first Starship prototype—is this a big deal?". arstechnica.
  77. ^ @elonmusk (15 May 2019). "SpaceX is doing simultaneous competing builds of Starship in Boca Chica Texas & Cape Canaveral Florida" (Tweet) – via Twitter.
  78. ^ a b c d "SpaceX Starship hardware mystery solved amid reports of Florida factory upheaval". 2 December 2019.
  79. ^ a b Ralph, Eric (17 July 2020). "SpaceX scraps Florida Starship Mk2 prototype". TESLARATI. Retrieved 4 September 2020.
  80. ^ a b Elon Musk [@elonmusk] (28 December 2019). "We're now building flight design of Starship SN1, but each SN will have at least minor improvements, at least through SN20 or so of Starship V1.0" (Tweet) – via Twitter.
  81. ^ a b Ralph, Eric (18 October 2019). "SpaceX's fourth Starship prototype has begun to take shape in Florida". Retrieved 4 April 2020.
  82. ^ Ralph, Eric (26 February 2020). "SpaceX Starship rolls to Texas launch pad ahead of next big test campaign". www.teslarati.com. Retrieved 1 February 2021.
  83. ^ Space Boca Chica - Starship SN1 cryo proof test failure - Feb 28,2020. NASASpaceflight – via YouTube.
  84. ^ "SpaceX expediting Mk3 construction in Texas, pausing Florida-based Starship builds". 3 December 2019.
  85. ^ BocaChicaGal (29 March 2020). "SpaceX Boca Chica - Starship SN3 exits high-bay ahead of roll to the pad". youtube.com. NASAspaceflight.com. Retrieved 1 February 2020.
  86. ^ a b Berger, Eric (3 April 2020). "SpaceX loses its third Starship prototype during a cryogenic test". arstechnica.
  87. ^ "Starship SN3 failure due to bad commanding. SN4 already under construction". 5 April 2020.
  88. ^ a b "SpaceX Starship factory speeding towards Elon Musk's production goals". 2 April 2020.
  89. ^ BocaChicaGal (24 April 2020). "SpaceX Boca Chica - Starship SN4 rollout to the Launch Site". youtube.com. NASAspaceflight.com. Retrieved 1 February 2020.
  90. ^ Wall, Mike (6 May 2020). "SpaceX's Starship SN4 prototype fires rocket engine for 1st time". Space.com.
  91. ^ Thompson, Amy. "SpaceX Starship SN4 prototype explodes in dramatic fireball". www.teslarati.com.
  92. ^ SpaceX Boca Chica - Starship SN5 Rolls to the Pad (YouTube). NASASpaceflight. 25 June 2020.
  93. ^ Bergin, Chris (27 July 2020). "Starship SN5 completes successful Static Fire test". nasaspaceflight.com.
  94. ^ a b Baylor, Michael (3 August 2020). "Starship SN5 conducts successful 150-meter flight test". NASASpaceFlight. Retrieved 6 August 2020.
  95. ^ a b Bergin, Chris (7 February 2021). "Starship SN10's Raptors installed as testing begins". NasaSpaceFlight. RIP SN5 workers began cutting into the SN5 sections
  96. ^ @fael097 (11 May 2020). "SN6's fwd dome sleeved Awesome pictures by Mary aka @BocaChicaGal" (Tweet) – via Twitter.
  97. ^ "SpaceX set for a swift return to testing following Starship SN4 anomaly". 5 June 2020.
  98. ^ Ralph, Eric (13 April 2020). "SpaceX rolls next Starship prototype to the launch pad". www.teslarati.com. Retrieved 1 February 2021.
  99. ^ Bergin, Chris (17 August 2020). "Starship SN6 fires up Raptor SN29". nasaspaceflight.com.
  100. ^ Malik, Tariq (3 September 2020). "SpaceX launches Starship SN6 prototype test flight on heels of Starlink mission". space.com.
  101. ^ "Up close and personal with SN6 as it gets dismantled". 7 January 2021.
  102. ^ "Starship SN5 completes successful Static Fire test". 27 July 2020.
  103. ^ SpaceX Boca Chica - SN8 Rolled Out to Launch site - SN9 Forward Dome Readied for Stacking (YouTube). NASASpaceflight. 27 September 2020.
  104. ^ a b Ralph, Eric. "SpaceX Starship nails 'flip' maneuver in explosive landing video". www.teslarati.com.
  105. ^ "Starship SN6 fires up Raptor SN29". 23 August 2020.
  106. ^ a b SpaceX Boca Chica: Starship SN9 Rolls Out to the Launch Pad. NASASpaceFlight (YouTube). 23 December 2020.
  107. ^ a b c d Baylor, Michael. "Starship SN9 History". nextspaceflight.com. Retrieved 29 January 2021.
  108. ^ SpaceX Boca Chica - Starship SN10 parts arriving as SN6 looks forward to hop (YouTube). 3 September 2020. Retrieved 13 February 2021.
  109. ^ a b Malik, Tariq (29 January 2021). "SpaceX has two Starship prototypes on the pad at the same time". Space.com. Retrieved 30 January 2021.
  110. ^ a b Ralph, Eric. "SpaceX Starship static fire bodes well for a launch later this week". www.teslarati.com.
  111. ^ a b Mike, Wall (3 March 2021). "SpaceX's SN10 Starship prototype lands after epic test launch — but then explodes". space.com.
  112. ^ SpaceX Boca Chica - SN11 Parts Spotted (YouTube). 9 September 2020. Retrieved 13 February 2021.
  113. ^ Ralph, Eric (8 March 2021). "SpaceX rolls Starship to the launch pad five days after last flight test". www.teslarati.com.
  114. ^ "Starship SN11 returns to pre-launch testing - Super Heavy BN1 rollout to follow". NASASpaceFlight.com. 22 March 2021. Retrieved 22 March 2021.
  115. ^ "SpaceX launches Starship SN11 rocket prototype, but misses landing". Space.com. 31 March 2021.
  116. ^ SpaceX Boca Chica - SN5 and SN6 Moved Outside - SN12 Leg Skirt (30 September) (YouTube). 1 October 2020. Retrieved 13 February 2021.
  117. ^ a b c d e f g h i j k l Bergin, Chris (7 February 2021). "Starship SN10's Raptors installed ahead of testing and refined landing attempt". NASASpaceFlight.com. Retrieved 8 February 2021.
  118. ^ @RGVarialphotos (11 April 2021). "New addition to nose cone structure, hexagram will be placed on top" (Tweet) – via Twitter.
  119. ^ @BocaChicaGal (13 April 2021). "Another section has been attached to the top of the nosecone testing rig" (Tweet) – via Twitter.
  120. ^ SpaceX Boca Chica - Starship SN13 exists as SN8 readies for the big day. NASASpaceFlight (YouTube). 20 October 2020. Retrieved 13 February 2021.
  121. ^ SpaceX Boca Chica - Starship SN14 parts arrive. NASASpaceFlight (YouTube). 10 October 2020. Retrieved 13 February 2021.
  122. ^ SpaceX Boca Chica - Starship SN15 appears amid SN11 Stacking and Lunar Mock Up outfitting. NASASpaceFlight (YouTube). 18 November 2020. Retrieved 13 February 2021.
  123. ^ "Starship SN15 rolls to launch site as Raptor testing ups a gear". 8 April 2021.
  124. ^ a b @NASASpaceflight (26 April 2021). "STATIC FIRE!" (Tweet) – via Twitter.
  125. ^ a b @elonmusk (27 April 2021). "Starship SN15 static fire completed, preparing for flight later this week" (Tweet) – via Twitter.
  126. ^ "SpaceX Starship prototype makes clean landing". BBC. 6 May 2021.
  127. ^ Elon Musk [@elonmusk] (7 May 2021). "Might try to refly SN15 soon" (Tweet) – via Twitter.
  128. ^ @astro_g_dogg (5 May 2021). "#SN15 standing tall on the landing pad!" (Tweet) – via Twitter.
  129. ^ Starship SN16 Fully Stacked | SpaceX Boca Chica. NASASpaceFlight (YouTube). 4 December 2020. Retrieved 13 February 2021.
  130. ^ a b Starship SN16 Fully Stacked (YouTube). 2 May 2021. Retrieved 2 May 2021.
  131. ^ SpaceX Boca Chica: From Super Heavy to Starship SN17 - new vehicles point to exciting future. NASASpaceFlight (YouTube). 17 December 2020. Retrieved 26 January 2021.
  132. ^ a b SpaceX Boca Chica: Super Heavy BN2 Forward Dome Spotted - Damaged Raptor Loaded onto Raptor Van (YouTube). 19 January 2021. Retrieved 26 January 2021.
  133. ^ a b SpaceX Boca Chica - Super Heavy prototype BN1 ready for additional stacking. NASASpaceFlight (YouTube). 20 February 2020. Retrieved 20 February 2021.
  134. ^ a b c SpaceX Boca Chica - SN20 Leg Skirt Spotted - BN1 Booster Double Section Lifted Onto New Stand. NASASpaceFlight (YouTube). 7 March 2021. Retrieved 8 March 2021.
  135. ^ @elonmusk (8 December 2018). "The new design is metal" (Tweet) – via Twitter.
  136. ^ @elonmusk (8 December 2018). "Fairly heavy metal, but extremely strong" (Tweet) – via Twitter.
  137. ^ Ralph, Eric (9 December 2018). "SpaceX CEO Elon Musk teases new Starship photos and "heavy metal" BFR". Teslarati. Archived from the original on 9 December 2018. Retrieved 9 December 2018. wide-reaching changes to BFR’s general structural composite, Musk at long last confirmed what some had suspected – now known as the Starship/Super Heavy — the BFR program has officially moved away from carbon fiber composites as the primary material of choice for the rocket's structure and propellant tanks, instead pivoting to what Musk described as a "fairly heavy metal".
  138. ^ D'Agostino, Ryan (22 January 2019). "Elon Musk: Why I'm Building the Starship out of Stainless Steel". Popular Mechanics. Retrieved 30 May 2019.
  139. ^ Commercial Space Transportation Experimental Permit -- Experimental Permit Number: EP19-012, FAA, 21 June 2019, accessed 29 June 2019.
  140. ^ Ralph, Eric (12 March 2019). "SpaceX begins static Starhopper tests as Raptor engine arrives on schedule". Teslarati. Retrieved 22 March 2019.
  141. ^ Gebhardt, Chris (18 March 2019). "Starhopper first flight as early as this week; Starship/Superheavy updates". NASASpaceFlight.com. Retrieved 22 March 2019.
  142. ^ D'Agostino, Ryan (22 January 2019). "Elon Musk: Why I'm Building the Starship out of Stainless Steel". popularmechanics.com. Popular Mechanics. Archived from the original on 22 January 2019. Retrieved 22 January 2019.
  143. ^ a b c d e f g Gebhardt, Chris (3 April 2019). "Starhopper conducts Raptor Static Fire test". NASASpaceFlight.com. Archived from the original on 4 April 2019. Retrieved 4 April 2019.
  144. ^ a b c Baylor, Michael (2 June 2019). "SpaceX readying Starhopper for hops in Texas as Pad 39A plans materialize in Florida". NASASpaceFlight.com. Retrieved 3 June 2019.
  145. ^ Baylor, Michael (27 August 2019). "SpaceX's Starhopper completes 150 meter test hop". NASASpaceFlight. Archived from the original on 2 December 2019. Retrieved 27 August 2019.
  146. ^ Grush, Loren (3 April 2019). "SpaceX just fired up the engine on its test Starship vehicle for the first time". The Verge. Archived from the original on 4 April 2019. Retrieved 4 April 2019.
  147. ^ https://mobile.twitter.com/elonmusk/status/1113613409767964673
  148. ^ a b Baylor, Michael (17 May 2019). "SpaceX considering SSTO Starship launches from Pad 39A". NASASpaceFlight. Retrieved 16 December 2019.
  149. ^ Bergin, Chris [@NASASpaceflight] (5 April 2019). "StarHopper enjoys second Raptor Static Fire!" (Tweet). Retrieved 23 May 2019 – via Twitter.
  150. ^ a b Berger, Eric (15 May 2019). "SpaceX plans to A/B test its Starship rocketship builds". Ars Technica. Archived from the original on 19 May 2019. Retrieved 20 May 2019.
  151. ^ a b c Gray, Tyler (28 May 2019). "SpaceX ramps up operations in South Texas as Hopper tests loom". NASASpaceFlight.com. Retrieved 30 May 2019.
  152. ^ "Commercial Space Transportation Experimental Permit, No. EP19-012" (PDF). Office of Commercial Space Transportation, Federal Aviation Administration. 21 June 2019. Retrieved 11 July 2019. This article incorporates text from this source, which is in the public domain.
  153. ^ Ralph, Eric (24 December 2018). "SpaceX CEO Elon Musk: Starship prototype to have 3 Raptors and "mirror finish"". Teslarati. Archived from the original on 24 December 2018. Retrieved 24 December 2018.
  154. ^ Foust, Jeff (24 December 2018). "Musk teases new details about redesigned next-generation launch system". SpaceNews. Retrieved 25 December 2018.
  155. ^ a b 'Totally Nuts'? Elon Musk Aims to Put a Starship in Orbit in 6 Months. Here's SpaceX's Plan. Mike Wall, Space.com. 30 September 2019.
  156. ^ @elonmusk (30 May 2019). "Wings/flaps & leg design changing again (sigh). Doesn't affect schedule much though" (Tweet) – via Twitter.
  157. ^ a b @elonmusk (22 September 2019). "Adding the rear moving fins to Starship Mk1 in Boca Chica, Texas" (Tweet) – via Twitter.
  158. ^ SpaceX installs two Starship wings ahead of Elon Musk’s Saturday update. Eric Ralph, TeslaRati. 22 September 2019.
  159. ^ a b c Elon Musk tweets a sneak peek at his vision for SpaceX’s Starship mega-rocket. Alan Boyle,GeekWire. 22 September 2019.
  160. ^ Berger, Eric (26 July 2019). "SpaceX's Starship prototype has taken flight for the first time". Ars Technica. Retrieved 8 August 2019.
  161. ^ Foust, Jeff (27 August 2019). "SpaceX's Starhopper completes test flight". SpaceNews. Retrieved 28 August 2019.
  162. ^ Elon Musk (28 September 2019). Starship Update (video). SpaceX. Event occurs at 1:45. Retrieved 30 September 2019 – via YouTube.
  163. ^ Malik, Tariq (28 September 2019). "Elon Musk Unveils SpaceX's New Starship Plans for Private Trips to the Moon, Mars and Beyond". Space.com. Retrieved 29 September 2019.
  164. ^ Zafar, Ramish (28 September 2019). "SpaceX's Starship Mk1 Expected To Be Ready For 20km Test In 2 Months". wccftech.com. Retrieved 29 September 2019.
  165. ^ Matsunaga, Samantha (28 September 2019). "Five things we learned from Elon Musk's rollout of the SpaceX Starship prototype". Los Angeles Times. Retrieved 29 September 2019.
  166. ^ "SpaceX's Starship is a new kind of rocket, in every sense". The Economist. 5 October 2019. Retrieved 23 November 2019.
  167. ^ Wall, Mike (30 September 2019). "'Totally Nuts'? Elon Musk Aims to Put a Starship in Orbit in 6 Months. Here's SpaceX's Plan". Space.com. Retrieved 23 November 2019.
  168. ^ Grush, Loren (20 November 2019). "SpaceX's prototype Starship rocket partially bursts during testing in Texas". The Verge. Retrieved 10 March 2020.
  169. ^ Wall, Mike (20 November 2019). "SpaceX's 1st Full-Size Starship Prototype Suffers Anomaly in Pressure Test". Space.com. Retrieved 21 November 2019.
  170. ^ Marley, Ronnie (20 November 2019). "SpaceX moving to MK3 vehicle following incident at Boca Chica Facility". CBS News. Retrieved 10 March 2020.
  171. ^ Sheetz, Michael (17 October 2019). "Aerial video shows SpaceX beginning construction of another Starship rocket in Florida". CNBC. Retrieved 18 October 2019.
  172. ^ @elonmusk (25 September 2019). "Mk1 ship is around 200 tons dry & 1400 tons wet, but aiming for 120 by Mk4 or Mk5. Total stack mass with max payload is 5000 tons" (Tweet) – via Twitter.
  173. ^ @elonmusk (22 September 2019). "For aero control, it comes down to % of cross-sectional area moving vs not. Flexible as to whether front or rear, so long as within bounds of center of mass & pressure" (Tweet) – via Twitter.
  174. ^ a b c @elonmusk (22 September 2019). "Nose tip has forward movable fins, cold gas attitude control thrusters, header tanks for landing, composite pressure vessels, several large batteries, etc. Placed up there to balance high mass of Raptors & rear fins at the bottom" (Tweet) – via Twitter.
  175. ^ @elonmusk (22 September 2019). "Stability is controlled by (very) rapid movement of rear & fwd fins during entry & landing, as well as ACS thrusters. The smaller leeward "fin" would simply be used as a leg" (Tweet) – via Twitter.
  176. ^ @elonmusk (24 September 2019). "Many powerful electric motors & batteries. Force required is enormous, as entire fin moves. More about this on the 28th" (Tweet) – via Twitter.
  177. ^ A conversation with Elon Musk about Starship, The Everyday Astronaut, 1 October 2019.
  178. ^ Musk, Elon [@elonmusk] (30 December 2019). "Almost everything is different. These parts are stamped vs manually bump-formed & TIP TIG welded vs flux core. Higher precision, stronger joints & 20% mass reduction" (Tweet) – via Twitter.
  179. ^ Ralph, Eric (28 January 2020). "SpaceX is ready to build the first Starship destined for space after latest tests".
  180. ^ Ralph, Eric (12 January 2020). "SpaceX just blew up a Starship tank on purpose and Elon Musk says the results are in".
  181. ^ a b Elon Musk [@elonmusk] (27 January 2020). "Starship 9m test tank made 7.5 bar at room temp! Small leak at a weld doubler. Will be repaired & retested at cryo" (Tweet) – via Twitter.
  182. ^ Elon Musk [@elonmusk] (29 January 2020). "8.5 bar" (Tweet) – via Twitter.
  183. ^ January 2020, Hanneke Weitering 30. "SpaceX just destroyed a huge tank for its Starship on purpose. Here's the video!". Space.com.
  184. ^ Elon Musk [@elonmusk] (10 January 2020). "Dome to barrel weld made it to 7.1 bar, which is pretty good as ~6 bar is needed for orbital flight. With more precise parts & better welding conditions, we should reach ~8.5 bar, which is the 1.4 factor of safety needed for crewed flight" (Tweet) – via Twitter.
  185. ^ a b c Baylor, Michael (19 February 2020). "SpaceX beginning final assembly of Starship SN1 ahead of roll to the pad". NASASpaceFlight. Retrieved 10 March 2020.
  186. ^ Baylor, Michael (3 December 2019). "SpaceX expediting Mk3 construction in Texas, pausing Florida-based Starship builds". NASASpaceFlight. Retrieved 10 March 2020.
  187. ^ a b Wall, Mike (10 March 2020). "SpaceX's latest Starship prototype passes big tank pressure test". Space.com. Retrieved 10 March 2020.
  188. ^ a b Foust, Jeff (1 March 2020). "Second Starship prototype damaged in pressurization test". SpaceNews. Retrieved 10 March 2020.
  189. ^ "Starship SN3 failure due to bad commanding. SN4 already under construction". 5 April 2020.
  190. ^ a b "Starship SN3 failure due to bad commanding. SN4 already under construction". NASASpaceFlight.com. 5 April 2020. Retrieved 19 April 2020.
  191. ^ Ralph, Eric (17 April 2020). "SpaceX is about to reuse (part of) a Starship rocket". TESLARATI. Retrieved 19 April 2020.
  192. ^ Baylor, Michael (26 April 2020). "SN4 becomes first full-scale Starship prototype to pass cryogenic proof test". NASASpaceFlight. Retrieved 23 September 2020.
  193. ^ Arevalo, Evelyn (9 May 2020). "SpaceX completes another round of Starship tests at Boca Chica". Tesmanian. Retrieved 23 September 2020.
  194. ^ Ralph, Eric (22 May 2020). "SpaceX Starship prototype charred but intact after catching fire [photos]".
  195. ^ Foust, Jeff (29 May 2020). "SpaceX Starship prototype destroyed after static-fire test". SpaceNews. Retrieved 30 May 2020.
  196. ^ Berger, Eric (5 March 2020). "Inside Elon Musk's plan to build one Starship a week—and settle Mars". Ars Technica. Retrieved 10 March 2020.
  197. ^ Bergin, Chris (27 July 2020). "Starship SN5 completes successful Static Fire test". NASASpaceFlight.com. Retrieved 4 August 2020.
  198. ^ Darrell Etherington (5 August 2020). "SpaceX Successfully Flies its Starship Prototype to a Height of Around 500 Feet". techcrunch.
  199. ^ @bocachicagal (4 February 2021). "The crew are currently cutting around the upper portion of Starship SN5" (Tweet). Retrieved 4 February 2021 – via Twitter.
  200. ^ SpaceX Boca Chica: New 3mm Thick Test Tank Stacked - Starship SN6 Scrapped (YouTube). NASASpaceflight.com. 12 January 2021.
  201. ^ a b c d Baylor, Michael (15 July 2020). "Starship SN5 set for a static fire followed shortly by a 150-meter hop attempt". NASASpaceFlight. Retrieved 17 July 2020. The most recent test tank, designated SN7, achieved a record pressure before it failed. SN7 was the pathfinder vehicle for the switch to 304L stainless steel. The next test tank – designated SN7.1 – will feature further build-quality improvements, as it attempts to break the record set by SN7.
  202. ^ "As Starships line up, Musk calibrates expectations for SN8 test". 1 November 2020. Retrieved 3 November 2020.
  203. ^ Business, Jackie Wattles, CNN. "Space X's Mars prototype rocket exploded yesterday. Here's what happened on the flight". CNN. Retrieved 10 December 2020.
  204. ^ "SpaceX Boca Chica - First Super Heavy Booster Parts - SN8 Flaps Installed" – via www.youtube.com.
  205. ^ @BocaChicaGal (22 October 2020). "A beautiful sky behind a fully stacked Starship. SN8 you are beautiful" (Tweet) – via Twitter.
  206. ^ a b Baylor, Michael. "Starship SN8 History". nextspaceflight.com. Retrieved 29 January 2021.
  207. ^ "Starship SN8 | 12.5-kilometer hop". Everyday Astronaut. 10 November 2020. Retrieved 11 December 2020.
  208. ^ Elon Musk [@elonmusk] (9 December 2020). "Fuel header tank pressure was low during landing burn, causing touchdown velocity to be high & RUD" (Tweet) – via Twitter.
  209. ^ Wall, Mike (10 December 2020). "SpaceX's Starship SN8 Prototype Soars on Epic Test Launch, with Explosive Landing". Scientific American. Retrieved 3 March 2021.
  210. ^ Ralph, Eric (14 December 2020). "SpaceX almost drops finished Starship prototype - but it might be salvageable". TESLARATI. Retrieved 13 February 2021.
  211. ^ SpaceX Boca Chica - Starship SN9 Gets a New Forward Flap - Tankzilla Prepared for move (YouTube). NASASpaceflight. 20 December 2020.
  212. ^ "Starship SN9 rolled to launch site – Super Heavy construction ramps up". Retrieved 7 January 2021.
  213. ^ a b Bergin, Chris (28 December 2020). "Starship SN9's time to shine – test series targets a New Year's resolution". NASASpaceFlight.com. Retrieved 29 December 2020.
  214. ^ Wall 13, Mike (January 2021). "SpaceX's Starship SN9 prototype fires up rocket engines three times in one day". Space.com. Retrieved 14 January 2021.
  215. ^ January 2021, Mike Wall 15. "SpaceX swapping out two engines on Starship SN9 prototype ahead of test flight". Space.com. Retrieved 17 January 2021.
  216. ^ Foust, Jeff (29 January 2021). "FAA reviews delay SpaceX Starship test". SpaceNews. Retrieved 30 January 2021.
  217. ^ Bergin, Chris. "Nice try, SN9! But didn't hit SN10 or the Tank Farm". Retrieved 2 February 2021.
  218. ^ SpaceX Boca Chica - Starship Landing Pad Work ahead of SN10 Launch - SN11/SN16 Prepare, retrieved 11 March 2021
  219. ^ @elonmusk (4 February 2021). "It was foolish of us not to start 3 engines & immediately shut down 1, as 2 are needed to land. Will these changes be able to be implemented into the SN10 test flight? Yes" (Tweet) – via Twitter.
  220. ^ Wall, Mike (25 February 2021). "SpaceX fires up SN10 Starship prototype for 2nd time". space.com.
  221. ^ @elonmusk (13 February 2021). "Success on landing probability is ~60% this time" (Tweet) – via Twitter.
  222. ^ @elonmusk (3 March 2021). "Launch abort on slightly conservative high thrust limit. Increasing thrust limit & recycling propellant for another flight attempt today" (Tweet) – via Twitter.
  223. ^ "SpaceX's Starship rocket lands but then explodes". 4 March 2021 – via www.bbc.co.uk.
  224. ^ "Elon Musk reveals why the SN10 Starship exploded". Engadget.
  225. ^ Bergin, Chris (8 March 2021). "Starship SN11 arrives at Pad B as SpaceX plans for the future". NASASpaceFlight.com. Retrieved 9 March 2021.
  226. ^ Bergin, Chris (12 March 2021). "That concludes Cryo proof testing for Starship SN11". Twitter. Retrieved 12 March 2021.
  227. ^ Bergin, Chris (12 March 2021). "Starship SN11 RCS (Reaction Control System) testing". Twitter. Retrieved 12 March 2021.
  228. ^ Bergin, Chris (15 March 2021). "Starship SN11. Aborted static fire". Twitter. Retrieved 15 March 2021.
  229. ^ Bergin, Chris (22 March 2021). "STATIC FIRE! Starship SN11 has fired up her three engines ahead of a test flight (as early as Tuesday), pending good test data (looked/sounded good!)". Twitter. Retrieved 22 March 2021.
  230. ^ Baylor, Michael (25 March 2021). "SpaceX will conduct a second static fire test after one of three Raptor engines on Starship SN11 had to be removed for repairs". Twitter. Retrieved 25 March 2021.
  231. ^ Mahlmann, Trevor (25 March 2021). "It's up and it's good!". Twitter. Retrieved 25 March 2021.
  232. ^ Baylor, Michael (25 March 2021). "SpaceX is targeting March 26 for Starship SN11's static fire and flight test, per a county road and beach closure notice". Twitter. Retrieved 25 March 2021.
  233. ^ Bergin, Chris (26 March 2021). "SpaceX Starship SN11 completes another static fire with at least 1 raptor engine". Twitter. Retrieved 25 March 2021.
  234. ^ Musk, Elon (30 March 2021). "Looks like engine 2 had issues on ascent & didn't reach operating chamber pressure during landing burn, but, in theory, it wasn't needed". Twitter. Retrieved 30 March 2021.
  235. ^ Bergin, Chris (30 March 2021). "Ended in a RUD". Twitter. Retrieved 30 March 2021.
  236. ^ @elonmusk (5 April 2021). "Ascent phase, transition to horizontal & control during free fall were good. A (relatively) small CH4 leak led to fire on engine 2 & fried part of avionics, causing hard start attempting landing burn in CH4 turbopump. This is getting fixed 6 ways to Sunday" (Tweet) – via Twitter.
  237. ^ @bocachicagal (23 January 2021). "Meanwhile, at SpaceX Boca Chica Starship SN10 took a peek out of the high bay as Starship SN12's aft section was being scrapped" (Tweet) – via Twitter.
  238. ^ @elonmusk (25 November 2020). "Major upgrades are slated for SN15" (Tweet) – via Twitter.
  239. ^ "Starship SN15 Flight Test". SpaceX. 5 May 2021. Archived from the original on 5 May 2021. Retrieved 6 May 2021.
  240. ^ "SpaceX installs Starlink dish on upgraded Starship prototype". 14 April 2021.
  241. ^ @TerminalCount (4 April 2021). "A thrust simulator has been installed at Pad A for SN15 testing!" (Tweet) – via Twitter.
  242. ^ a b "When will SN15 launch? Live Updates". Retrieved 14 April 2021.
  243. ^ "SpaceX Transports Starship SN15 To The Launch Pad Ahead Of Flight Test". 15 April 2021.
  244. ^ @op_boca (9 April 2021). "Today, SpaceX teams conducted an ambient pressure test of Starship SN15" (Tweet) – via Twitter.
  245. ^ "SpaceX's upgraded Starship gets frosty during cryogenic proof test". 12 April 2021.
  246. ^ @thejackbeyer (9 April 2021). "Starship SN15 rolled out to the launch site and was mounted on Suborbital Pad A ahead of cryo-proof testing with the thrust simulation rams" (Tweet) – via Twitter.
  247. ^ @spacex360 (14 April 2021). "The thrust simulator has been removed from SN15" (Tweet) – via Twitter.
  248. ^ @TheFavoritist (28 April 2021). "Starship SN15 static fires its Raptors again, though this time we believe only a single was engine fired" (Tweet) – via Twitter.
  249. ^ Timmer, John (5 May 2021). "SpaceX successfully lands a Starship test flight". arstechnica.com.
  250. ^ @nextspaceflight (16 January 2021). "VIDEO: While Starship SN9 repairs continue, SpaceX is making progress on new prototypes" (Tweet). Retrieved 2 May 2021 – via Twitter.
  251. ^ @NASASpaceflight (7 April 2021). "As Starship SN15 prepares to roll to the launch site, the Forward Dome of SN20 has been spotted, with this vehicle set to be an Orbital Class Starship" (Tweet) – via Twitter.
  252. ^ a b @_brendan_lewis (9 April 2021). "The current status of SpaceX's Starship & Superheavy prototypes" (Tweet) – via Twitter.
  253. ^ a b Bergin, Chris (15 March 2021). "BN3 and SN20 targeting orbital flight - (subject to change, especially the schedule!)". Twitter.
  254. ^ SpaceX Boca Chica - Starship Test Tank mated - Jan 7, 2020 (YouTube). NASASpaceFlight. 7 January 2020.
  255. ^ Ralph, Eric (10 January 2020). "SpaceX prepares new Starship tank for explosive test after rapid construction".
  256. ^ a b c Aravelo, Evelyn (10 January 2020). "SpaceX conducted a pressure test on a Starship dome tank at Boca Chica today". Tesmaian. Retrieved 1 February 2021.
  257. ^ a b SpaceX Boca Chica - Starship Nosecone Heads to Launch Site - Bulkhead Flip (YouTube). NASASpaceFlight. 23 January 2020.
  258. ^ a b c SpaceX Boca Chica - Header Tank tested to failure. Test Tank preps for transport (YouTube). NASASpaceFlight. 26 January 2020.
  259. ^ SpaceX Boca Chica - Starship Bulkhead/Dome Test Tank 2 Mated (YouTube). NASASpaceFlight. 25 January 2020.
  260. ^ BocaChicaGal (28 January 2020). "SpaceX Boca Chica - Starship Test Tank 2 road trip to the Launch Site". YouTube. NASAspaceflight. Retrieved 1 February 2021.
  261. ^ a b c SpaceX Boca Chica - Starship Test Tank 2 Destructive Cryo Test (YouTube). NASASpaceFlight. 29 January 2020.
  262. ^ @elonmusk (9 February 2020). "First two domes in frame are for SN2, third is SN1 thrust dome" (Tweet) – via Twitter.
  263. ^ BocaChicaGal (7 March 2020). "SpaceX Boca Chica - Starship SN2 Test Tank arrives at Launch Site". youtube.com. NASAspaceflight.com. Retrieved 1 February 2020.
  264. ^ a b SpaceX Boca Chica - Starship SN2 Test Tank transported from Launch Site (YouTube). NASASpaceFlight. 16 March 2020.
  265. ^ SpaceX Boca Chica - All of the Starships out in the ope (YouTube). NASASpaceFlight. 25 May 2020. SN7's first rings have been spotted
  266. ^ SpaceX Boca Chica - Starship SN7 Test Tank rolls - Canards arrive (YouTube). NASASpaceflight. 13 June 2020.
  267. ^ a b c Mali, Tariq (23 June 2020). "Boom! SpaceX pops huge Starship SN7 test tank on purpose in pressure test". Space.com. Retrieved 30 January 2021. SpaceX pushed a massive tank for its latest Starship prototype beyond its limits Tuesday (June 23) in an intentionally explosive test in South Texas. The Starship SN7 prototype tank ruptured during a pressure test at SpaceX's Boca Chica proving grounds, the second in just over a week for the spacecraft component.
  268. ^ SpaceX Boca Chica - SN7.1 Test Tank Rolled Out For Testing (YouTube). NASASpaceflight. 8 September 2020.
  269. ^ a b c Wall, Mike (24 September 2020). "SpaceX pops Starship tank on purpose in explosive pressure test". Space.com. Retrieved 13 February 2021.
  270. ^ SpaceX Boca Chica - Starship SN11 ready to complete Stacking Operations (YouTube). NASASpaceFlight. 27 December 2020.
  271. ^ SpaceX Boca Chica - New Thrust Dome flipped. Starship SN9 aborts Static Fire tests (YouTube). NASASpaceflight. 22 January 2021.
  272. ^ a b Starship SN11 Abort Static Fire - SN7.2 Moved to the Production Site. NASASpaceFlight (YouTube). 16 March 2021. Retrieved 16 March 2021. It is unclear if crews are repairing it for more testing or scrapping it
  273. ^ SpaceX Boca Chica - Starship Header Tank Pressurization Test (YouTube). NASASpaceFlight. 25 January 2020.
  274. ^ January 2020, Chris Bergin 10. "Farewell Test Tank 2, and we thank you". twitter.com. Retrieved 29 January 2020.
  275. ^ March 2020, Mike Wall 10. "SpaceX's latest Starship prototype passes big tank pressure test". Space.com. Retrieved 2 April 2020.
  276. ^ Baylor, Michael. "Starship SN7 History". nextspaceflight.com. Retrieved 9 February 2021.
  277. ^ Starship's SN7.1 Pushed To Failure (Time Lapse), LabPadre channel, 23 September 2020, retrieved 27 September 2020.
  278. ^ @elonmusk (26 September 2020). "8 bar differential in ullage, 9 bar at base due to propellant head. It's enough. Improvements in work" (Tweet) – via Twitter.
  279. ^ Ralph, Eric (27 January 2021). "SpaceX's thin-skinned Starship 'test tank' passes first trial". Teslarati. Retrieved 30 January 2021. Known as Starship SN7.2, SpaceX’s latest ‘test tank’ is the third to carry the SN7 moniker and appears to have been built primarily to test refinements to the rocket’s structural design...the tank’s most important task is determining if future Starships (and perhaps Super Heavy boosters) can be built out of thinner, lighter steel rings. Its domes appear to be identical to past ships but writing on the exterior of the tank strongly implied that its three rings were built out of 3mm steel rather than the 4mm sheets that have made up every Starship built in the last 12 months.
  280. ^ Baylor, Michael. "Starship SN7.2 History". nextspaceflight.com. Retrieved 6 February 2021.
  281. ^ Mary (15 March 2021). "Starship SN7.2 is headed back to the production site at SpaceX Boca Chica". Twitter.
  282. ^ Ralph, Eric (9 November 2020). "SpaceX begins assembling first Starship Super Heavy booster in South Texas". Teslarati. Retrieved 15 November 2020.
  283. ^ SpaceX Boca Chica - First Super Heavy Booster Parts - SN8 Flaps Installed (YouTube). NASASpaceFlight. 23 September 2020.
  284. ^ a b c d e f Musk, Elon [@elonmusk] (30 March 2021). "BN1 is a manufacturing pathfinder, so will be scrapped. We learned a lot, but have already changed design to BN2. Goal is to get BN2 with engines on orbital pad before end of April. It might even be orbit-capable if we are lucky" (Tweet) – via Twitter.
  285. ^ a b @BocaChicaGal (13 April 2021). "The dismantling of BN1 has begun" (Tweet) – via Twitter.
  286. ^ "Starship SN15 to undergo flight test Tuesday". 4 May 2021. BN1 has since been cut into sections and sent to the scrapyard
  287. ^ Bergin, Chris [@NASASpaceflight] (28 March 2021). "As Starship SN11 awaits launch, the Forward Dome Section for Super Heavy Prototype BN3 has been spotted at the Production Site" (Tweet) – via Twitter.
  288. ^ "NasaSpaceFlight Super Heavy BN3 section spotted, SpaceX Boca Chica". 28 March 2021.
  289. ^ "Starship SN15 prepares for flight following major NASA vindication". 18 April 2021.
  290. ^ Musk, Elon [@elonmusk] (18 March 2021). "Yes, Booster 1 is a production pathfinder, figuring out how to build & transport 70 meter tall stage. Booster 2 will fly" (Tweet) – via Twitter.
  291. ^ Mary [@BocaChicaGal] (18 March 2021). "Wow.....Booster BN1 is fully stacked in the high bay" (Tweet) – via Twitter.
  292. ^ "SpaceX Boca Chica: Super Heavy BN2 Forward Dome Spotted - Damaged Raptor Loaded onto Raptor Van". NasaSpaceFlight You tube video. 20 January 2021.
  293. ^ "New Booster Dome Spotted - Starship SN16 Aft Section Lifted into Mid Bay SpaceX Boca Chica". NasaSpaceFlight You tube video. 21 April 2021.
  294. ^ Lewis, Brendan (1 April 2021). "The current status of SpaceX's Starship & Superheavy prototypes". Retrieved 1 April 2021.
  295. ^ "Super Heavy BN3 section spotted SpaceX Boca Chica". NasaSpaceFlight You tube video. 28 March 2021.
  296. ^ "More Sections for Super Heavy BN3 Spotted - Starship SN15 Wiggles its Flaps SpaceX Boca Chica". NasaSpaceFlight You tube video. 4 April 2021.
  297. ^ "uper Heavy Thrust Dome Spotted SpaceX Boca Chica". NasaSpaceFlight You tube video. 24 April 2021.
  298. ^ Kenniston, Brady (4 April 2021). "Rings sections for BN3's aft are spotted at the production site". Retrieved 4 April 2021.
  299. ^ "Starship SN8 12.5-Kilometer hop". Retrieved 5 December 2020.
  300. ^ Musk, Elon [@elonmusk] (4 April 2019). "Starhopper completed tethered hop. All systems green" (Tweet) – via Twitter.
  301. ^ Grush, Loren (3 April 2019). "SpaceX just fired up the engine on its test Starship vehicle for the first time". The Verge. Archived from the original on 4 April 2019. Retrieved 4 April 2019.
  302. ^ Berger, Eric (26 July 2019). "SpaceX's Starship prototype has taken flight for the first time". Ars Technica. Retrieved 26 July 2019.
  303. ^ Burghardt, Thomas (25 July 2019). "Starhopper successfully conducts debut Boca Chica Hop". NASASpaceFlight.com. Retrieved 26 July 2019.
  304. ^ a b c Baylor, Michael (27 August 2019). "SpaceX's Starhopper completes 150 meter test hop". NASASpaceFlight. Retrieved 27 August 2019.
  305. ^ "SpaceX Starhopper Rocket Prototype Aces Highest (and Final) Test Flight". space.com. Retrieved 29 August 2019.
  306. ^ 150 Meter Starhopper Test. SpaceX. 27 August 2019. Retrieved 27 August 2019 – via YouTube.
  307. ^ Mosher, Dave (7 August 2019). "SpaceX may cannibalize its first Mars rocket-ship prototype in Elon Musk's race to launch Starship". Business Insider. Retrieved 27 August 2019.
  308. ^ Ralph, Eric (27 August 2019). "SpaceX scrubs Starhopper's final Raptor-powered flight as Elon Musk talks finicky igniters". Teslarati. Retrieved 27 August 2019.
  309. ^ a b Ralph, Eric (4 August 2020). "SpaceX Starship leaps towards Mars with picture-perfect hop debut". Teslarati. Retrieved 4 August 2020.
  310. ^ Baylor, Michael (3 August 2020). "Starship SN5 conducts successful 150-meter flight test". NASASpaceFlight.com. Retrieved 20 March 2021.
  311. ^ Baylor, Michael (4 August 2020). "Starship SN5 conducts successful 150-meter flight test". NASASpaceflight. Retrieved 4 August 2020.
  312. ^ Clark, Stephen (5 August 2020). "SpaceX clears big hurdle on next-gen Starship rocket program". Spaceflight Now. Retrieved 5 August 2020.
  313. ^ a b c "Starship SN6 maiden hop complete - Super Heavy is coming". NASASpaceFlight.com. 3 September 2020. Retrieved 20 March 2021.
  314. ^ "SN6 begins test campaign as future Starships hatch plans for SpaceX's next leap". nasaspaceflight.com. 16 August 2020.
  315. ^ "NOTAM". Retrieved 5 December 2020.
  316. ^ a b c Bergin, Chris (9 December 2020). "From hops to hopes - Starship SN8 advances test program into the next phase". NASASpaceFlight.com. Retrieved 8 February 2021.
  317. ^ Bergin, Chris (18 October 2020). "Starship SN8 pressing to Static Fire and nosecone installation firsts". NASASpaceflight. Retrieved 18 October 2020.
  318. ^ a b Cotton, Ethan. "Starship SN9: 10 kilometer flight". Everyday Astronaut. Retrieved 1 February 2021.
  319. ^ What's really going on with Elon Musk, the FAA, and Starship?, Eric Berger, Ars Technica, 29 January 2021, retrieved 30 January 2021.
  320. ^ a b c Starship SN9 High-Altitude Flight Test (YouTube). SpaceX. 2 February 2021.
  321. ^ Baylor, Michael. "Starship SN9 History". nextspaceflight. Retrieved 27 January 2021.
  322. ^ What's holding up the next test of SpaceX's Starship? Elon Musk blames the FAA., Washington Post, 28 January 2021, accessed 30 January 2021.
  323. ^ Bergin, Chris (28 January 2021). "Starship SN9 fails to gain FAA green light for Friday attempt". NASA Space Flight. Retrieved 29 January 2021.
  324. ^ Hollister, Sean (21 February 2021). "The FAA is no longer concerned with SpaceX's Starship SN9 and SN8". The Verge. Retrieved 20 March 2021.
  325. ^ Cotton, Ethan (22 February 2021). "When will SN10 launch? Live Updates". Everyday Astronaut. Retrieved 28 February 2021.
  326. ^ a b Baylor, Michael. "Starship SN10 History". Next Spaceflight. Retrieved 28 February 2021.
  327. ^ a b Wall, Mike (4 March 2021). "SpaceX's SN10 Starship prototype lands after epic test launch — but then explodes". space.com. Retrieved 4 March 2021.
  328. ^ Starship SN10 High-Altitude Flight Test. SpaceX (YouTube). 3 March 2021.
  329. ^ a b @elonmusk (9 March 2021). "SN10 engine was low on thrust due (probably) to partial helium ingestion from fuel header tank. Impact of 10m/s crushed legs & part of skirt. Multiple fixes in work for SN11" (Tweet) – via Twitter.
  330. ^ @elonmusk (6 March 2021). "This was way past leg loads. They got squashed hard" (Tweet) – via Twitter.
  331. ^ Etherington, Darrell. "SpaceX's Starship prototype flies to 32,000 feet and sticks the landing in third flight test". TechCrunch. Retrieved 3 March 2021.
  332. ^ a b Starship | SN11 | High-Altitude Flight Test, retrieved 30 March 2021
  333. ^ Baylor, Michael [@nextspaceflight] (25 March 2021). "SpaceX is targeting March 26 for Starship SN11's static fire and flight test, per a county road and beach clsoure notice" (Tweet) – via Twitter.
  334. ^ Musk, Elon (30 March 2021). "Looks like engine 2 had issues on ascent & didn't reach operating chamber pressure during landing burn, but, in theory, it wasn't needed". Twitter. Retrieved 30 March 2021.
  335. ^ Bergin, Chris (30 March 2021). "Ended in a RUD". Twitter. Retrieved 30 March 2021.
  336. ^ @thesheetztweetz (2 April 2021). "SpaceX's Starship SN11 captured hurtling back down, with debris seen flying" (Tweet) – via Twitter.
  337. ^ Ralph, Eric (5 April 2021). "Musk blames SpaceX's latest Starship explosion on Raptor engine leak". teslarati.com. Retrieved 5 April 2021.
  338. ^ "SpaceX launches Starship SN15 rocket and sticks the landing in high-altitude test flight". Space.com. 5 May 2021.
  339. ^ "Starship SN15". nextspaceflight.com. Retrieved 22 April 2021.
  340. ^ Kettley, Sebastian (9 April 2021). "SpaceX Starship launch: Will Starship SN15 launch this weekend?". Express.co.uk. Retrieved 10 April 2021.
  341. ^ @elonmusk (5 May 2021). "Starship [SN15] landing nominal!" (Tweet) – via Twitter.
  342. ^ Bergen, Chris (5 May 2021). "... SUCCESS! Now for post landing safing". Twitter. Retrieved 5 May 2021.
  343. ^ Bergen, Chris (5 May 2021). "Looks like safing is going well!..." Twitter. Retrieved 5 May 2021.
  344. ^ Timmer, John (5 May 2021). "SpaceX successfully lands a Starship test flight". Ars Technica. Archived from the original on 5 May 2021. Retrieved 5 May 2021.
  345. ^ Ralph, Eric (7 May 2017). "Elon Musk says SpaceX might refly Starship after historic landing". Teslarati. Retrieved 7 May 2017.