SpaceX Starship

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SpaceX Starship
BFR at stage separation (3).jpg
Artist's concept of the Starship following stage separation
ManufacturerSpaceX
DesignerElon Musk (lead designer)[1][2][3]
Country of originUnited States
Specifications
Spacecraft typeCrewed, fully reusable
Launch mass1,335,000 kg (2,943,000 lb)
Dry mass85,000 kg (187,000 lb)
Payload capacity150,000 kg (330,000 lb)[4]
Dimensions
Length55 m (180 ft)
Diameter9 m (30 ft)
Production
StatusIn development
Built3 (test vehicles)
Maiden launchTBD,
c. late 2019
Engines3 Raptor (sea-level nozzle) + 3 Raptor vacuum[5]
Thrust12,000 kN; 2,600,000 lbf (1,200 tf)
Specific impulse380 s (3.7 km/s)[6]
FuelSubcooled CH
4
 / LOX

The SpaceX Starship is a fully reusable second stage and space vehicle under development as part of SpaceX's BFR launch vehicle. It is being designed to be a long-duration cargo- and passenger-carrying spacecraft that will also serve as the two-stage-to-orbit BFR's second stage and integrated payload section.[7][8] It is also an independent rocket in its own right, as it began an extensive suborbital flight testing program in 2019,[9] and is later planned to fly independently on various planets and Solar System bodies.[10][11]

Integrated system testing of Starship began in March 2019 with the addition of a single Raptor rocket engine to the first flight-capable propellant structure, Starhopper. Starhopper was used through August 2019 for static testing and low-altitude, low-velocity flight testing of vertical launches and landings.[12] It made its first hop, flying to an altitude of about 20 meters, in July followed by a second, larger hop in August to a height of approximately 150 meters, in both cases descending to a controlled landing.[13] Two additional test articles, Starship orbital prototypes, are being built by competing teams in Texas and in Florida.[14] They are planned to be used for high-altitude, high-velocity testing.[15] All test articles have a 9-meter (30 ft)-diameter stainless steel hull.

SpaceX is planning to launch commercial payloads using Starship no earlier than 2021.[16]

History[edit]

The initial 2017 ship design was of carbon-composite construction with a delta wing and six Raptor engines (four vacuum and two sea-level)

The Starship engine layout and reentry aerodynamic surface designs have changed noticeably since the initial public unveiling of the 9-meter (30 ft) diameter rocket in September 2017, in order to balance objectives like payload mass, landing capabilities, and reliability.

The initial design at the unveiling showed the ship with six Raptor engines (two sea-level, four vacuum) and a delta wing with split flaps.[17]

By late 2017, SpaceX added a third sea-level engine to increase engine-out capability and allow landings with greater payload mass, bringing the total number of engines to seven.[18] Seven engines, three sea-level and four vacuum, remained the design until September 2018, when a new version of the design was shown at the announcement of the #dearMoon project. SpaceX indicated that early flights would happen with exclusively sea-level nozzle engines and showed animations depicting Starship with seven identical Raptor engines on the planned 2023 mission, the same engines to be used in the design of the first-stage of the BFR launch vehicle, Super Heavy.[6]

The late-2018 Starship design with seven sea-level Raptor engines and the revised aerodynamic control surface layout

In January 2019, Elon Musk announced that the Starship would no longer be constructed out of carbon fiber, and that stainless steel would be used instead to build the Starship. Musk cited several reasons including cost, strength, and ease of production to justify making the switch.[19]

In May 2019, the Starship design changed back to just six Raptor engines, with three optimized for sea-level and three optimized for vacuum.[5]

By late May 2019, the first prototype, "Starhopper", was preparing for untethered flight tests in South Texas, while two orbital prototypes were under construction, one in South Texas and one on the Florida space coast. The build of the first Super Heavy booster stage was expected to be underway by September.[12] 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.[20]

By June 2019, SpaceX publicly announced discussions had begun with three telecom companies for using Starship, rather than Falcon 9, for launching commercial satellites for paying customers as early as 2021. No specific companies or launch contracts were announced at that time.[16]

The Starship prototype made its initial flight test, a "hop" of around 20 m (66 ft) altitude, in late July 2019.[21] The prototype made its final "hop" in late August, reaching an altitude of around 150 m (490 ft)[22] and landing around 100 m (330 ft) from the launchpad.

Description[edit]

Starship is a 9-meter (30 ft)-diameter, 55-meter (180 ft)-tall,[6] fully reusable spacecraft design with a dry mass of 85,000 kg (187,393 lb),[23] powered by six methane/oxygen-propellant Raptor engines.[5] Total Starship thrust is approximately 11,500 kN; 2,600,000 lbf (1,170 tf).

Unusual for previous launch vehicle and spacecraft designs, Starship is to function as both a second stage for the BFR launch vehicle that provides acceleration to orbital velocity on all launches from Earth, and yet will also be used in space as an on-orbit long-duration spacecraft.[6][23]

The Starship design is intended to be fully reusable even when used as a second stage for orbital ascent from Earth. Starship is being designed so as to be capable of reentering Earth's atmosphere from orbital velocities and landing vertically, with a design goal of rapid reusability.

As announced in May 2019,[5] Starship will use three sea-level optimized Raptor engines and three vacuum-optimized Raptor engines. These sea-level engines are identical to the engines on the first-stage of the BFR launch vehicle, Super Heavy.[6] Subsequent versions for interplanetary travel are expected to utilize a vacuum-optimized Raptor engine variant to optimize specific impulse (Isp).

Starship is planned to eventually be built in at least three operational versions:[24]

  • Spaceship: a large, long-duration spacecraft capable of carrying passengers[24] or cargo to interplanetary destinations, to LEO, or between destinations on Earth.
  • Satellite delivery spacecraft: a vehicle able to transport and place spacecraft into orbit[16], or handle the in-space recovery of spacecraft and space debris for return to Earth or movement to another orbit. In the 2017 early design concept, this was shown with a large cargo bay door that can open in space to facilitate delivery and pickup of cargo.[24]
  • Tanker: a cargo-only propellant tanker to support the refilling of propellants in Earth orbit. The tanker will enable launching a heavy spacecraft to interplanetary space as the spacecraft being refueled can use its tanks twice, first to reach LEO and afterwards to leave Earth orbit. The tanker variant, also required for high-payload lunar flights, is expected to come only later; initial in-space propellant transfer will be from one standard Starship to another.[25]

Characteristics of Starship are to include:[26][24][27][23]

  • able to return from Earth orbit and land near the launch mount using retropropulsive landing and the reusable launch vehicle technologies developed earlier by SpaceX
  • landing reliability is projected by SpaceX to ultimately be able to achieve "airline levels" of safety due to engine-out capability.
  • rendezvous and docking operations will be automated
  • on-orbit propellant transfers from Starship tankers to Starship spaceships or cargo spaceships, but initially from one standard orbital Starship to another.[25]
  • a Starship and its payload is intended to be able to transit to the Moon or fly to Mars after on-orbit propellant loading
  • stainless steel structure and tank construction. Its strength-to-mass ratio is comparable to or better than the earlier SpaceX design alternative of carbon fiber composites across the anticipated temperature ranges, from the low temperatures of cryogenic propellants to the high temperatures of atmospheric reentry[28]
  • some parts of the craft will be built with a stainless steel alloy that "has undergone [a type of] cryogenic treatment, in which metals are ... cold-formed/worked [to produce a] cryo-treated steel ... dramatically lighter and more wear-resistant than traditional hot-rolled steel."[28]
  • a thermal protection system against the harsh conditions of atmospheric reentry. This may include ceramic tiles,[29] or may utilize a double stainless-steel skin with active coolant flowing in between the two layers. Options under study in design include hexagonal stainless steel or ceramic[30] tiles that could be used on the windward side of Starship, with some areas additionally containing multiple small pores that will allow for transpiration cooling.[31][32][33]
  • as envisioned in the 2017 design unveiling, the Starship is to have a pressurized volume of approximately 1,000 m3 (35,000 cu ft), which could be configured for up to 40 cabins, large common areas, central storage, a galley, and a solar flare shelter for Mars missions plus 12 unpressurized aft cargo containers of 88 m3 (3,100 cu ft) total.[23]
  • flexible design options; for example, a possible design modification to the base Starship—expendable 3-engine Starship with no fairing, canards, rear fins, nor landing legs—to optimize mass ratio for interplanetary exploration with robotic probes.[34]

When Starship is used for BEO launches to Mars, the functioning of the overall expedition system will necessarily include propellant production on the Mars surface. This is necessary for the return trip and to reuse the spaceship to keep costs as low as possible. Lunar destinations (circumlunar flybys, orbits and landings) will be possible without lunar-propellant depots, so long as the spaceship is refueled in a high-elliptical orbit before the lunar transit begins.[24] Some lunar flybys will be possible without orbital refueling as evidenced by the mission profile of the #dearMoon project.[35]

Starship specifications (planned)[edit]

Comparison

General characteristics

  • Capacity: ≤ 100 people (for long-duration flights)
  • Diameter: 9 m (29 ft 6 in) [6]
  • Height: 55 m (180 ft 5 in) [6]
  • Volume: 1,000 m3 (35,000 cu ft) [23]
  • Empty weight: 85,000 kg (187,393 lb) [17]
  • Gross weight: 1,335,000 kg (2,943,171 lb) [17]
  • Fuel capacity: 1,100,000 kg (2,400,000 lb)
  • Powerplant: 3 × Raptor rocket engine (sea-level optimized)[5]
  • Powerplant: 3 × Raptor rocket engine (vacuum optimized)[5]

Prototypes[edit]

Two test articles were being built by March 2019, and three by May.[14] The low-altitude, low-velocity Starship test flight rocket was used for initial integrated testing of the Raptor rocket engine with a flight-capable propellant structure, and was slated to also test the newly designed autogenous pressurization system that is replacing traditional helium tank pressurization as well as initial launch and landing algorithms for the much larger 9-meter-diameter rocket.[31] SpaceX originally developed their reusable booster technology for the 3-meter-diameter Falcon 9 from 2012 to 2018. The Starhopper prototype was also the platform for the first flight tests of the full-flow staged combustion methalox Raptor engine, where the hopper vehicle was flight tested with a single engine in July/August 2019,[36] but could be fitted with up to three engines to facilitate engine-out tolerance testing.[31]

The high-altitude, high-velocity 'Starship orbital prototypes' (MK1 and MK2) will be used to develop and flight test novel thermal protection systems and hypersonic reentry control surfaces.[31] Each orbital prototype is expected to be outfitted with more than three Raptor engines.[12][37]

Starhopper[edit]

Starhopper

The construction of the initial test article—the "Starship test flight rocket"[38] "test hopper,"[39] "Starship Hopper"[40] or "Starhopper"[15][41] —was begun in early December 2018 and the external frame and skin was complete by 10 January 2019. Constructed outside in the open on a SpaceX property just two miles (3.2 km) from Boca Chica Beach in South Texas, the external body of the rocket rapidly came together in less than six weeks. Originally thought by watchers of construction at the SpaceX South Texas Launch Site to be the initial construction of a large water tower, the stainless steel vehicle was built by welders and construction workers in more of a shipyard form of construction than traditional aerospace manufacturing. The full Starhopper vehicle is 9 meters (30 ft) in diameter and was originally 39 meters (128 ft) tall in January 2019.[39][28] Subsequent wind damage to the nose cone of the vehicle resulted in a SpaceX decision to scrap the nose section, and fly the low-velocity hopper tests with no nose cone, resulting in a much shorter test vehicle.[42]

From mid-January to early-March, 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 two miles (3.2 km) to the launch pad on 8 March.[43] Following initial integrated system testing of the Starhopper test vehicle with Raptor engine serial number 2 engine (Raptor S/N 2) in early April, the engine was removed for post-test analysis and several additions were made to the Starhopper. Attitude control system thrusters were added to the rocket, along with shock absorbers for the non-retractable landing legs, and quick-disconnect connections for umbilicals. Raptor S/N 4 was installed in early June for fit checks, but the first test flight that is not tethered was expected to fly with Raptor S/N 5,[42] until it suffered damage during testing at SpaceX Rocket Development and Test Facility, in McGregor, Texas. Subsequently Raptor S/N 6 was the engine used by Starship Hopper for its untethered flights.[44]

The test article is being used to flight test a number of subsystems of the Starship and to begin to expand the flight envelope as the Starship design is iterated.[39][45][46] Initial tests began in March 2019.[47] All test flights of the "test hopper"[39] will be at low altitude, under 5 kilometers (16,000 ft),[48] but SpaceX may limit them to even lower altitudes and do the mid-altitude testing on the Mk1 and Mk2 larger prototypes. 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.[49] 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.[50] The first flight test of the Starhopper test vehicle, and also the first flight test of any full-flow staged combustion rocket engine ever, was on 25 July 2019. For initial flight tests of orbital-class rocket engines, this was not a full-duration burn but just a 22-second test. SpaceX is developing their next-generation rocket to be reusable from the beginning, just like an aircraft, and thus needs to start with narrow flight test objectives, while still aiming to land the rocket successfully to be used subsequently in further tests to expand the flight envelope.[36] The second and final untethered test flight of the Starhopper test article was carried out on 27 August 2019, to a VTVL altitude of 150 m (490 ft).[44]

See Testing section below for a list of tests.

Starship orbital prototypes[edit]

Starship under construction in Cocoa, Fl., in August 2019

Two orbital prototype ships—referred to as Mk1 or Mk I,[51] and Mk2[12]—are under construction as of May 2019, one in Boca Chica, South Texas and one on the space coast of Florida in Cocoa.

Initial construction was underway by December 2018 when subsections of a Starship orbital prototype—also referred to as the "Starship Mk1 orbital design" were stated to be under construction in California.[51] Planned for high-altitude and high-velocity testing,[52] the orbital prototype will be taller than the hopper, have thicker skins, and a smoothly curving nose section.[53] Both prototypes will fly test flights with at least three Raptor engines, and possibly all six.[12][37][12]

By March 2019, construction of the full external structure and propellant tanks of the first orbital prototype (Mk1[37]) was well underway at the SpaceX "ad-hoc South Texas 'shipyard'," with an expectation that the vehicle could be complete and ready to begin testing as early as June.[54] The new build of additional 9-meter diameter stainless steel structures in South Texas in late February was originally misattributed and thought to be a second and more substantial version of the Starhopper's upper section, following the destruction of the first Starhopper upper section, damaged by high winds in January.[43] The Mk1 prototype will fly with three Raptor engines.[55]

By May 2019, SpaceX revealed that they were building not one but two orbital prototypes, Mk1 in Texas and a second one, Mk2, in Florida. The two Starship prototypes (MK1 and MK2) are being constructed by competing teams, that are required to share progress, insights, and build techniques with the other team, but neither team is required to use the other team's techniques.[12][14][9]

Testing[edit]

Integrated system testing of the first prototype (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."[31]

The first static fire test of the Starhopper test vehicle, with a single Raptor engine attached, occurred on 3 April 2019. The firing was a few seconds duration, and was classed as successful by SpaceX.[31] A second tethered test followed just two days later, on 5 April.[14][56]

By May 2019, SpaceX was planning to conduct flight tests both in South Texas and on the Florida space coast.[9][42][12] The first test flight—or hop—was conducted in Texas on 25 July 2019, and attained a height of 18 m (59 ft).[57][36]

Test № Date Vehicle Orbital/suborbital (height) Duration Remarks
1 3 April 2019 Starhopper Raptor/Starhopper integration hot fire test. a few seconds First static fire of Starhopper, single Raptor engine (production-level serial number (S/N) 2).[42] Also was first hot fire test of Raptor in a vertical orientation.
2 5 April 2019 Starhopper Suborbital ("hit tether limits", about 1 m or 3 ft) a few seconds Second tethered hop which hit tethered limits. With a single Raptor engine, S/N 2.[42]
3 16 July 2019 Starhopper Pad test static fire full duration static fire (5 seconds) Single-raptor static fire occurred, using S/N 6 production-level Raptor.[58] The test was followed several minutes later by the water fire suppression system on the pad coming on and the ignition of a discharge of methane around the Starhopper vehicle.[58]
4 25 July 2019[59] Starhopper Suborbital (20 m (66 ft))[36] about 22 seconds First free flight test. Single Raptor engine, S/N 6. Was previously scheduled for the day before but was aborted.[36] A test flight attempt on 24 July was scrubbed.[60]
5 27 August 2019[44][61] Starhopper Suborbital (150 m (490 ft))[44] About 57 seconds[62] Single Raptor engine, S/N 6. SpaceX called this the "150 meter Starhopper Test" on their livestream. Starhopper will be retired after this launch, with some parts being reused for other tests.[44][63] The test flight attempt on 26 August was scrubbed due to a problem with the Raptor engine igniters.[60]
Future tests
6 October 2019 (planned)[44][64] Starship orbital prototype Suborbital (20 km (12 mi)) With 3 raptor engines.
TBD Starship orbital prototype Suborbital high-altitude, high-velocity testing
c. 2020 Starship orbital prototype Orbital

Intended uses[edit]

Starship is intended to become the mainline SpaceX orbital vehicle, as SpaceX has announced it intends to fully replace its existing Falcon 9 launch vehicle and Dragon space capsule fleet with Starship/Super Heavy during the early 2020s.[11][24][17]:24:50–27:05

Starship will be utilized for:[11][26]

In 2017, SpaceX mentioned the theoretical ability of using a boosted Starship to carry passengers on suborbital flights between two points on Earth in under one hour, providing commercial long-haul transport on Earth, competing with long-range aircraft.[67][68] SpaceX however announced no concrete plans to pursue this two stage "Earth-to-Earth" possibility.[45][69] use of BFR.[17] Over two years later, in May 2019, Musk floated the idea of using single-stage Starship to travel up to 10,000 kilometers (6,200 mi) on Earth-to-Earth flights at speeds approaching Mach 20 (6.8 km/s; 25,000 km/h; 15,000 mph) with an acceptable payload saying it "dramatically improves cost, complexity & ease of operations."[70]

See also[edit]

References[edit]

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