Starship (rocket)

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Starship is the fully-reusable second stage and spaceship of the SpaceX BFR rocket. It is a long-duration cargo- and passenger-carrying spacecraft that also serves as the BFR launch vehicle second stage and integrated payload section.[1][2]

Three 9 m (30 ft)-diameter stainless steel Starship test articles are being built, and one had already begun integrated system testing by March 2019. The Starship test flight rocket—Starhopper—will be used for initial integrated testing of the Raptor rocket engine with a flight-capable propellant structure as well as for low-altitude, low-velocity flight testing of launches and landings. It began hotfire testing in April.[3] Two additional test articles, Starship orbital prototypes, are being built by competing teams in South Texas and along the space coast of Florida.[4] They are planned to be used after mid-2019 for high-altitude, high-velocity testing.[5] Integrated system testing of Starhopper, including the first flight test, began in April 2019.

Artist's concept of the Starship following stage separation from a Super Heavy booster rocket.

Description[edit]

Starship is a 9 m (30 ft)-diameter, 55 m (180 ft)-tall,[6] fully reusable rocket design with a dry mass of 85,000 kg (187,393 lb),[7] powered by seven methane/oxygen-propellant Raptor engines producing over 2,000 kilonewtons (450,000 lbf) of thrust in each engine.[6] Total Starship thrust is approximately 14 MN (3,100,000 lbf).

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][7]

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.

In the 2018 design, Starship will use seven sea-level rated Raptor engines, identical engines as used 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 will eventually be built in at least three operational versions:[8]

Major characteristics of Starship include:[9][8][10][7]

  • being designed such that the ship can 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
  • a Starship and its payload will 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[11]
  • 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."[11]
  • the thermal protection system against the harsh conditions of atmospheric reentry will utilize a double stainless-steel skin with active coolant flowing in between the two layers. Hexagonal stainless steel tiles will blanket the windward side of Starship, and some areas will additionally contain multiple small pores that will allow for transpiration cooling.[3][12][13]
  • 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.[7]
  • 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.[14]

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.[8] Some lunar flybys will be possible without orbital refueling as evidenced by the mission profile of the SpaceX lunar tourism mission.[15]

Prototypes[edit]

SpaceX Starship hopper three view external layout, as of January 2019. The nose cone of the Starhopper test article was subsequently damaged by high winds, and then scrapped. SpaceX then said the Starhopper test article would conduct testing, including low-altitude low-velocity flight testing, without any nose cone at all, the stubby tank section of the vehicle. Thus, by February, this image no longer represented the "look" of the Starhopper.

Two test articles were being built by March 2019, and three by May.[4] 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 will 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. SpaceX originally developed their reusable booster technology for the 3-meter-diameter Falcon 9 from 2012 to 2018. It will also be the platform for the first flight tests of the full-flow staged combustion methalox Raptor engines, where the hopper vehicle is expected to be flight tested with up to three engines to facilitate engine-out tolerance testing.[3]

The high-altitude, high-velocity Starship orbital prototypes will be used to develop and flight test novel thermal protection systems and hypersonic reentry control surfaces.[3] Each orbital prototype is expected to be outfitted with more than three Raptor engines.

Starship test flight rocket[edit]

The construction of the initial test article—the "Starship test flight rocket,"[16] "test hopper,"[17] or "Starhopper"[5][18]—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 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.[17][11] Subsequent wind damage to the nose cone of the vehicle resulted in a SpaceX decision to scrap it, and fly the low-velocity hopper tests with no nose cone,[citation needed] resulting in a much shorter test vehicle. 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 to the launch pad on 8 March.[19]

The test article will be used to flight test a number of subsystems of the Starship and will be used to expand the flight envelope as the Starship design will be finalized.[17][20][21] Initial tests began in March 2019, flight tests are expected for April.[22] All test flights of the "test hopper"[17] will be low altitude, under 5 kilometers (16,000 ft).[23] 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.[24] See Testing section, below, for full testing history and details.

Starship orbital prototypes[edit]

Two orbital prototype ships are currently under constructions, one in South Texas and one on the space coast of Florida. Initial construction was underway by December 2018 when subsections of a Starship orbital prototype—also referred to as the "Starship Mk I orbital design"—were stated to be under construction in San Pedro, California.[25] Planned for high-altitude and high-velocity testing,[26] the orbital prototype will be taller than the suborbital hopper, have thicker skins, and a smoothly curving nose section.[27] By March 2019, construction of the full external structure and propellant tanks of the first orbital prototype 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.[28] 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 coastal winds in January.[19]

By May 2019, SpaceX revealed that they were building two orbital prototypes, one in Texas and a second one in Florida. The two Starship prototypes are being constructed by competing teams, who 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.[4][29]


Testing[edit]

Integrated system testing of the first Starship 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, WDRs and a few pre-burner tests."[3]

The first static fire test of the Starhopper test vehicle, with only a single Raptor engine attached, occurred on 3 April 2019. The firing was a few seconds duration, and was classed as successful by SpaceX.[3] A second tethered test followed just two days later, on 5 April.[4][30]

The county has announced potential road closures to enable further testing in effect for 28–30 May 2019.[29]

Test No. Date Vehicle Height Duration Remarks
1 3 April 2019 Starhopper A few inches a few seconds First Static fire and a tethered hop of the Starhopper. Only had one Raptor Engine.[3]
2 5 April 2019 Starhopper "hit tether limits", presumably about 3 feet (1 m). a few seconds Second tethered hop which hit tethered limits. Only had one Raptor Engine.[31]

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.[32][8][33]:24:50–27:05

Starship will be utilized for:[32][9]

In addition, SpaceX has 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.[36][37] However, SpaceX has announced no concrete plans to pursue this use case.[33][20][38]


See also[edit]

  • ITS — an earlier SpaceX concept for a much larger but similar spaceship

References[edit]

  1. ^ Lawler, Richard (20 November 2018). "SpaceX BFR has a new name: Starship". Engadget. Retrieved 21 November 2018.
  2. ^ Boyle, Alan (19 November 2018). "Goodbye, BFR … hello, Starship: Elon Musk gives a classic name to his Mars spaceship". GeekWire. 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)
  3. ^ a b c d e f g Gebhardt, Chris (3 April 2019). "Starhopper conducts Raptor Static Fire test". NASASpaceFlight.com. Retrieved 4 April 2019.
  4. ^ a b c d SpaceX considering SSTO Starship launches from Pad 39A, Michael Baylor, NASASpaceFlight.com, 17 May 2019, accessed 18 May 2019.
  5. ^ a b Ralph, Eric (12 March 2019). "SpaceX begins static Starhopper tests as Raptor engine arrives on schedule". Teslarati. Retrieved 22 March 2019.
  6. ^ a b c d Musk, Elon (17 September 2018). First Private Passenger on Lunar BFR Mission. SpaceX. Retrieved 18 September 2018 – via Youtube.
  7. ^ a b c d "Making Life Multiplanetary: Abridged transcript of Elon Musk's presentation to the 68th International Astronautical Congress in Adelaide, Australia" (PDF). SpaceX. September 2017.
  8. ^ a b c d e 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.
  9. ^ a b Gaynor, Phillip (9 August 2018). "The Evolution of the Big Falcon Rocket". NASASpaceFlight.com. Retrieved 30 March 2019.
  10. ^ Jeff Foust (15 October 2017). "Musk offers more technical details on BFR system". SpaceNews. Retrieved 15 October 2017. [Musk wrote,] "The flight engine design is much lighter and tighter, and is extremely focused on reliability."
  11. ^ a b c Ralph, Eric (24 December 2018). "SpaceX CEO Elon Musk: Starship prototype to have 3 Raptors and "mirror finish"". Teslarati. Retrieved 24 December 2018.
  12. ^ SpaceX Starship Will "Bleed Water" From Tiny Holes, Says Elon Musk. Kristin Houser, Futurism. 22 January 2019.
  13. ^ SpaceX CEO Elon Musk explains Starship's "transpiring" steel heat shield in Q&A. Eric Ralph, Teslarati News. 23 January 2019.
  14. ^ Ralph, Eric (1 April 2019). "SpaceX CEO Elon Musk proposes Starship, Starlink tech for Solar System tour". Teslarati. Retrieved 3 April 2019.
  15. ^ First Private Passenger on Lunar BFR Mission. Press conference streamed live at YouTube by SpaceX. 17 September 2018.
  16. ^ Murphy, Mike (10 January 2019). "Elon Musk shows off SpaceX's massive Starship test rocket". MarketWatch. Retrieved 12 January 2019.
  17. ^ a b c d Berger, Eric (8 January 2019). "Here's why Elon Musk is tweeting constantly about a stainless-steel starship". Ars Technica. Retrieved 12 January 2019.
  18. ^ Gebhardt, Chris (18 March 2019). "Starhopper first flight as early as this week; Starship/Superheavy updates". NASASpaceFlight.com. Retrieved 22 March 2019.
  19. ^ a b Ralph, Eric (9 March 2019). "SpaceX's Starship prototype moved to launch pad on new rocket transporter". Teslarati. Retrieved 22 March 2019.
  20. ^ a b Jeff Foust (15 October 2017). "Musk offers more technical details on BFR system". SpaceNews. Retrieved 15 October 2017. [The] spaceship portion of the BFR, which would transport people on point-to-point suborbital flights or on missions to the moon or Mars, will be tested on Earth first in a series of short hops. ... a full-scale Ship doing short hops of a few hundred kilometers altitude and lateral distance ... fairly easy on the vehicle, as no heat shield is needed, we can have a large amount of reserve propellant and don’t need the high area ratio, deep space Raptor engines.
  21. ^ 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.'
  22. ^ "SpaceX's Starship hopper steps towards first hop with several cautious tests". Teslarati. 29 March 2019. Retrieved 31 March 2019.
  23. ^ Foust, Jeff (24 December 2018). "Musk teases new details about redesigned next-generation launch system". SpaceNews. Retrieved 25 December 2018.
  24. ^ Grush, Loren (3 April 2019). "SpaceX just fired up the engine on its test Starship vehicle for the first time". The Verge. Retrieved 4 April 2019.
  25. ^ Elon Musk [@elonmusk] (22 December 2018). "We're building subsections of the Starship Mk I orbital design there [in San Pedro]" (Tweet) – via Twitter.
  26. ^ Elon Musk [@elonmusk] (10 January 2019). "Should be done with first orbital prototype around June" (Tweet) – via Twitter.
  27. ^ Kanter, Jake (11 January 2019). "Elon Musk released a photo of his latest rocket, and it already delivers on his promise of looking like liquid silver". Business Insider. Retrieved 13 January 2019.
  28. ^ Ralph, Eric (26 March 2019). "SpaceX's steel Starship glows during Earth reentry in first high-quality render". Teslarati. Retrieved 28 March 2019.
  29. ^ a b Berger, Eric (15 May 2019). "SpaceX plans to A/B test its Starship rocketship builds". Ars Technica. Retrieved 20 May 2019.
  30. ^ https://twitter.com/NASASpaceflight/status/1114372086208827392
  31. ^ Musk, Elon (5 April 2019). "Starhopper just lifted off & hit tether limits!pic.twitter.com/eByJsq2jiw". @elonmusk. Retrieved 7 April 2019.
  32. ^ a b Chris Gebhardt (29 September 2017). "The Moon, Mars, & around the Earth – Musk updates BFR architecture, plans". Retrieved 30 March 2019.
  33. ^ a b Elon Musk (29 September 2017). Becoming a Multiplanet Species (video). 68th annual meeting of the International Astronautical Congress in Adelaide, Australia: SpaceX. Retrieved 30 March 2019 – via YouTube.
  34. ^ Smith, Rich (8 December 2018). "A Renamed BFR Could Be Key to SpaceX's Satellite Internet Dream". The Motley Fool. Retrieved 6 April 2019.
  35. ^ Elon Musk [@elonmusk] (12 May 2018). "SpaceX will prob build 30 to 40 rocket cores for ~300 missions over 5 years. Then BFR takes over & Falcon retires. Goal of BFR is to enable anyone to move to moon, Mars & eventually outer planets" (Tweet) – via Twitter.
  36. ^ Sheetz, Michael (18 March 2019). "Super fast travel using outer space could be $20 billion market, disrupting airlines, UBS predicts". CNBC. Retrieved 30 March 2019.
  37. ^ Elon Musk (28 September 2017). BFR Earth to Earth (video). SpaceX. Event occurs at 1:45. Retrieved 30 March 2019 – via YouTube.
  38. ^ Neil Strauss (15 November 2017). "Elon Musk: The Architect of Tomorrow". Rolling Stone. Retrieved 30 March 2019.