Scaled Composites Stratolaunch

Short description: Mother ship aircraft designed to launch spacecraft

Stratolaunch

Role  | Mother ship aircraft
National origin | United States
Manufacturer  | Scaled Composites
First flight  | April 13, 2019[1]
Primary user  | Stratolaunch Systems
Number built | 1
Career
Other name(s) | Roc
Registration  | N351SL
Flights  | 9[2]

The Scaled Composites Model 351 Stratolaunch or Roc is an aircraft built by Scaled Composites for Stratolaunch Systems to carry air-launch-to-orbit (ALTO) rockets, and subsequently repurposed to offer air launch hypersonic flight testing after a change of ownership. It was announced in December 2011, rolled out in May 2017,[1] and flew for the first time on April 13, 2019, shortly after the death of founder Paul Allen. The aircraft features a twin-fuselage design and the longest wingspan ever flown, at 385 feet (117 m), surpassing the Hughes H-4 Hercules "Spruce Goose" flying boat of 321 feet (98 m). The Stratolaunch is intended to carry a 550,000-pound (250 t) payload and has a 1,300,000-pound (590 t) maximum takeoff weight.

The company ceased operations in May 2019, shortly after the first flight,[3] and placed all company assets, including the aircraft, for sale by June 2019.[4] In October 2019, Cerberus Capital Management acquired Stratolaunch Systems, including the Stratolaunch aircraft.[5] Stratolaunch announced in December 2019 that it would now be focusing on offering high-speed flight test services.[6] (As of April 2023), the Stratolaunch has flown ten times, including three with a hypersonic test aircraft, and been declared operational.[7]

## Contents

* 1 History
* 1.1 Early development
* 1.2 Testing
* 1.3 Development halt and sale
* 1.4 Post-ownership changes
* 2 Design
* 3 Specifications (Model 351 Stratolaunch)
* 4 See also
* 5 References
* 6 External links

## History

### Early development

In early 2011, Dynetics began studying the project and had approximately 40 employees working on it at the December 2011 public announcement. Stratolaunch originally planned to airlaunch the Falcon 9 Air by SpaceX, whose efforts began shortly before December.[8] Launching medium-sized payloads with the Falcon 9 dictated the aircraft size but SpaceX departed a year later.[9]

In May 2012, its specially constructed hangar was being built at the Mojave Air and Space Port in Mojave, California.[10] In October 2012, the first of two manufacturing buildings, an 88,000 sq ft (8,200 m2) facility for construction of the composite sections of the wing and fuselage, was opened for production.[11]

In August 2013, the Pegasus II was selected for the air-launch vehicle.[12] In August 2014, all solid-fuel propulsion was selected, rather than liquid-fuel for the Orbital Sciences launcher.[13] In August 2015, 200,000 lb (91 t) of structure was assembled.[14]

By June 2016, Scaled Composites had 300 people working on the project.[15] Virgin Orbit also planned to launch small satellites with the LauncherOne from a 747.[16] Orbital ATK dropped its Thunderbolt rocket project for medium-class payloads.[9] In October 2016, the Pegasus II was replaced by multiple Pegasus XL mounted underneath the carrier aircraft, developments of the original Pegasus rocket which had been launched 42 times since 1990.[17]

### Testing

By May 1, 2017, Stratolaunch had already spent hundreds of millions of dollars on the project.[9] On May 31, 2017, the aircraft was rolled out for fueling tests, and to be prepared for ground testing, engine runs, taxi tests, and ultimately, first flight. The company stated that it was aiming for a 2019 first-launch demonstration.[18] The Register newspaper in 2017 reported that Stratolaunch may have competition from the DARPA XS-1 or from Vector Space Systems by 2019.[19] By September 2017, engine testing was underway as well as testing of "control surfaces and electric, pneumatic and fire detection systems."[20] In December 2017, its first low-speed taxi test took it to 25 knots (46 km/h) on the runway, powered by its six turbofans, to test its steering, braking, and telemetry.[21] Higher-speed taxi tests began in 2018, reaching 40 knots (74 km/h) in February,[22] and 78 knots (144 km/h) in October.[23] On January 9, 2019, Stratolaunch completed a 110 knots (200 km/h) taxi test, and released a photograph of the nose landing gear lifted off the ground during the test.[24]

In January 2019, three months after the death of Stratolaunch founder and Microsoft co-founder Paul Allen, Stratolaunch abandoned the development of its PGA rocket engines and dedicated launchers. This left the Northrop Grumman Pegasus XL as the sole launch option for an orbital capability of 800 lb (360 kg). Stratolaunch was then reported to be aiming for a first flight within a few weeks and a first launch from the carrier in 2020.[25]

The aircraft first flew on April 13, 2019, at the Mojave Air and Space Port, reaching 17,000 feet (5,200 m) and speed of 165 knots (306 km/h) in a 2 hours 29 minutes flight.[26]

### Development halt and sale

The future of Stratolaunch had been in doubt since the death of company founder Paul Allen in October 2018, with speculation that Stratolaunch Systems could cease operations.[27] Allen had been the source of funds for the capital-intensive development program since the project began in 2010, and the company founding in 2011.[3]

In January 2019, Stratolaunch announced it was halting development of its air-launched family of launch vehicles.[3]

On May 31, 2019, the company announced that it would cease operations and that sale of its assets was being explored. An asking price of US$400 million was reported, which would include the sole aircraft, the company facilities, equipment, the designs and other intellectual property.[27][28] In June 2019 the Stratolaunch Systems company and assets were put up for sale by Vulcan for $400 million.[4]

By October 11, Stratolaunch announced it had new ownership and that it would continue regular operations, but did not disclose the identity of the investors.[29] In December, the new owner was revealed to be Cerberus Capital Management, a specialist in the acquisition of distressed companies.[5] After the acquisition, Stratolaunch is now focusing on offering high-speed flight test services.[6]

### Post-ownership changes

By early 2020, Stratolaunch was developing the Talon-A reusable, rocket-powered, hypersonic flight vehicle (the Vulcan Aerospace Hyper-A concept in 2018), intended to reach Mach 5-7 after launch. Single Talon-A launch flights were planned for 2022, with an ambitious target to carry up to three hypersonic vehicles at once the following year. Larger concept vehicles, the Talon-Z and Black Ice, could carry cargo or people to orbit.[30]

The Stratolaunch made its second flight on April 29, 2021.[31] Its third flight took place on January 16, 2022, from Mojave Air and Space Port; the flight lasted 4 hours 23 minutes and reached altitude of over 23,490 feet (7,160 m) and top speed of 330 km/h (180 kn).[32] It made its fourth flight on February 24, 2022.

On October 28, 2022, flight eight[33] was the first captive carry flight with the Talon-A separation test vehicle, TA-0.[34]

On January 13, 2023, flight nine achieved a record duration of over six hours.[35] Data on aerodynamic loads and interactions between the two vehicles were collected during this test.[36] By April 1 2023, flight ten marked the start of routine operations.[7] Data on primary and backup downlink performance were collected, prior to a first TA-0 separation test planned for later in 2023.[7]

## Design

Comparison showing wingspan

Stratolaunch has a twin-fuselage configuration, each 238 ft (73 m) long and supported by 12 main landing gear wheels and two nose gear wheels, for a total of 28 wheels.[18] The twin-fuselage configuration is similar to the Scaled Composites White Knight Two.[15] Each fuselage has its own empennage.[37]

The pilot, co-pilot and flight engineer are accommodated in the right fuselage cockpit.[38] The flight data systems are in the left fuselage.[39][40] The left fuselage cockpit is unmanned with storage space for up to 2,500lb of mission specific support equipment. Both fuselage cockpits are pressurized and separated by a composite pressure bulkhead from the remainder of the unpressurized vehicle.[41]

At 385 ft (117 m), it is the largest plane by wingspan, greater than a 300 ft (91 m) American football field.[18] The main center section is made up of four primary composite spars supported by four secondary spars.[41] The center section of the high-mounted, high aspect ratio wing is fitted with a Mating and Integration System (MIS), developed by Dynetics and capable of handling a 490,000 lb (220 t) load.[42] The wing houses six main and two auxiliary fuel tanks, with the main tanks located inboard adjacent to an engine. The auxiliary tanks are located in the inboard wing where the load-carrying structure joins the fuselage.[41]

Stratolaunch is powered by six Pratt & Whitney PW4056 engines positioned on pylons outboard of each fuselage,[43] providing 56,750 lbf (252.4 kN) of thrust per engine.[44] Many of the aircraft systems have been adopted from the Boeing 747-400, including the engines, avionics, flight deck, landing gear and other systems, reducing development costs.[8]

The flight controls include 12 cable-driven ailerons powered by hydraulic actuators, split rudders, and horizontal stabilizers on twin tail units. The wing has 14 electrically signaled, hydraulically actuated trailing-edge split flaps that also act as speed brakes. The hydraulic system and actuators, electrical system, avionics, pilot controls, and flight deck are from donor B747-400s. Approximately 250,000 lb of the aircraft's takeoff weight of 1,300,000 lb is from B747-400 components.[41]

The aircraft requires 12,000 ft (3,700 m) of runway to lift-off.[8] Rocket separation was originally planned at 35,000 ft (11,000 m).[38] A payload of 550,000 lb (250 t) can be flown.[9] Carrying a Pegasus II, it could originally deliver up to 13,500 lb (6.1 t) satellites to LEO or 4,500 lb (2.0 t) to a 15° GTO.[11] Launch of a Dream Chaser small spaceplane capable of transporting astronauts or payloads within 24 hours was also proposed.[45][46] A subsequent goal was to carry up to three Orbital ATK "Pegasus XL" rockets for high-altitude launches by 2022,[47][48] before the retargeting to hypersonic flight.

Within Scaled Composites, its model number is M351.[49] It is nicknamed "Roc" after Sinbad's Roc, the mythical bird so big it could carry an elephant.[38]

## Specifications (Model 351 Stratolaunch)

Drawing lines

Data from Stratolaunch[43]

General characteristics

* Length: 238 ft (73 m) [18]
* Wingspan: 385 ft (117 m) [18]
* Height: 50 ft (15 m) [18]
* Empty weight: 500,000 lb (226,796 kg) [18]
* Max takeoff weight: 1,300,000 lb (589,670 kg) [18]
* External payload: 550,000 lb (250,000 kg)[18]
* Powerplant: 6 × Pratt & Whitney PW4056 turbofan, 56,750 lbf (252.4 kN) thrust each [44]

Performance

* Maximum speed: 460 kn (530 mph, 850 km/h) [14]
* Range: 1,000 nmi (1,200 mi, 1,900 km)
* Ferry range: 2,500 nmi (2,900 mi, 4,600 km) [11]
* Service ceiling: 35,000[38] ft (11,000 m) with payload

## See also

* Airborne aircraft carrier
* Air-launched ballistic missile

Related development

* Pegasus rocket
* Scaled Composites White Knight

Aircraft of comparable role, configuration and era

* Conroy Virtus

Related lists

* List of large aircraft

## References

1. ↑ 1.0 1.1 "Stratolaunch airborne in first flight of world's largest aircraft". Flightglobal. April 13, 2019. https://www.flightglobal.com/news/articles/stratolaunch-airborne-in-first-flight-of-worlds-lar-457453/.
2. ↑ "The world's biggest plane has wings longer than a football field. Take a look at the Stratolaunch Roc, which just completed a 6-hour test flight in the Mojave Desert". https://www.businessinsider.com/worlds-biggest-airplane-stratolaunch-roc-photos-test-flight-wingspan-2023-1.
3. ↑ 3.0 3.1 3.2 Foust, Jeff (18 January 2019). "Stratolaunch abandons launch vehicle program". SpaceNews. https://spacenews.com/stratolaunch-abandons-launch-vehicle-program/.
4. ↑ 4.0 4.1 "The world's largest airplane is up for sale for $400 million". 14 June 2019. https://www.cnbc.com/2019/06/14/vulcan-selling-stratolaunch-worlds-largest-airplane-for-400-million.html.
5. ↑ 5.0 5.1 [Exclusive: Buyer of Paul Allen’s Stratolaunch space venture is secretive Trump ally], Geekwire, 11 December 2019, accessed 12 December 2019.
6. ↑ 6.0 6.1 @WJeanFloyd (10 December 2019). "Stratolaunch grew from 13 to 87 employees over the past 2 months.". https://twitter.com/WJeanFloyd/status/1204552846143713280.
7. ↑ 7.0 7.1 7.2 Stratolaunch. "Stratolaunch Completes Third Captive Carry Flight with Talon-A Vehicle". www.prnewswire.com (Press release). Retrieved 2023-04-02.
8. ↑ 8.0 8.1 8.2 Michael Mecham and Frank Morring, Jr. (December 19, 2011). "Allen Places Big Bet On Air Launches". Aviation Week & Space Technology. http://aviationweek.com/awin/allen-places-big-bet-air-launches.
9. ↑ 9.0 9.1 9.2 9.3 Foust, Jeff (May 31, 2017). "Stratolaunch rolls out giant aircraft". SpaceNews. http://spacenews.com/stratolaunch-rolls-out-giant-aircraft/.
10. ↑ Doug Messier (May 5, 2012). "Space Goose's Nest Grows in the Mojave". Parabolic Arc. http://www.parabolicarc.com/2012/10/05/space-gooses-nest-grows-in-the-mojave/.
11. ↑ 11.0 11.1 11.2 Chris Bergin (May 24, 2013). "Stratolaunch and Orbital – The Height of Air Launch". NASASpaceFlight.com. http://www.nasaspaceflight.com/2013/05/stratolaunch-orbital-air-launch/.
12. ↑ ATK (August 12, 2013). "ATK Gets Contract for Stratolaunch Propulsion System" (Press release). Archived from the original on December 27, 2017. Retrieved December 27, 2017.
13. ↑ Amy Butler (November 6, 2014). "Stratolaunch Drops Liquid Stage From Rocket System". Aviation Week Network. http://aviationweek.com/awin-only/stratolaunch-drops-liquid-stage-rocket-system-0.
14. ↑ 14.0 14.1 Jason Silverstein (February 26, 2015). "SEE IT: World's largest plane under construction in Calif.". NY Daily News. http://www.nydailynews.com/news/national/world-largest-plane-construction-calif-article-1.2131231.
15. ↑ 15.0 15.1 Gates, Dominic (June 19, 2016). "Paul Allen's giant plane takes shape in the desert, but its market is unclear". Seattle Times. https://www.seattletimes.com/business/boeing-aerospace/paul-allens-giant-plane-takes-shape-in-the-desert-but-its-market-is-unclear/.
16. ↑ Christian Davenport (June 20, 2016). "Why Microsoft co-founder Paul Allen is building the world's largest airplane". Washington Post. https://www.washingtonpost.com/news/the-switch/wp/2016/06/20/why-paul-allen-is-building-the-worlds-largest-airplane/.
17. ↑ Stephen Clark (October 10, 2016). "Stratolaunch announces plan to fly with Pegasus rockets". https://spaceflightnow.com/2016/10/10/stratolaunch-announces-plan-to-fly-with-pegasus-rockets.
18. ↑ 18.0 18.1 18.2 18.3 18.4 18.5 18.6 18.7 18.8 "Stratolaunch Aircraft Makes First Rollout To Begin Fueling Tests" (Press release). Stratolaunch. May 31, 2017. Archived from the original on June 1, 2017. Retrieved April 14, 2019.
19. ↑ Sharwood, Simon (June 1, 2017). "Microsoft founder Paul Allen reveals world's biggest-ever plane". https://www.theregister.co.uk/2017/06/01/paul_allen_stratolaunch/.
20. ↑ Foust, Jeff (September 19, 2017). "Engine test latest step for Stratolaunch's giant aircraft". SpaceNews. http://spacenews.com/engine-test-latest-step-for-stratolaunchs-giant-aircraft/.
21. ↑ "Stratolaunch Completes First Low-Speed Taxi Test" (Press release). Stratolaunch. December 18, 2017. Archived from the original on December 25, 2017. Retrieved December 27, 2017.
22. ↑ Baylor, Michael (February 26, 2018). "Stratolaunch conducts high-speed taxi tests on giant carrier aircraft". NASASpaceflight.com. https://www.nasaspaceflight.com/2018/02/stratolaunch-high-speed-taxi-tests-carrier-aircraft/.
23. ↑ Wall, Mike (October 29, 2018). "Stratolaunch's Rocket Carrier, the Biggest Airplane Ever Built, Aces Fastest Runway Test Yet". space.com. https://www.space.com/42281-stratolaunch-rocket-mothership-runway-test-video.html.
24. ↑ Alan Boyle (January 9, 2018). "Stratolaunch gets world's biggest airplane ready for takeoff with 136 mph taxi test". Geekwire. https://www.geekwire.com/2019/stratolaunch-gets-worlds-biggest-airplane-ready-takeoff-136-mph-taxi-test/.
25. ↑ Guy Norris (January 19, 2019). "Stratolaunch Terminates Rocket Engine and Launcher Programs". Aviation Week Network. http://aviationweek.com/space/stratolaunch-terminates-rocket-engine-and-launcher-programs.
26. ↑ "Stratolaunch becomes world's largest aircraft to fly". Flightglobal. April 13, 2019. https://www.flightglobal.com/news/articles/pictures-stratolaunch-becomes-worlds-largest-aircr-457453/.
27. ↑ 27.0 27.1 "Exclusive: Space firm founded by billionaire Paul Allen closing…". Reuters. 2019-06-01. https://www.reuters.com/article/us-space-exploration-stratolaunch-exclus-idUSKCN1T12FD.
28. ↑ Niles, Russ (15 June 2019). "Stratolaunch Price Tag $400,000,000". AVweb. https://www.avweb.com/aviation-news/stratolaunch-price-tag-400000000/.
29. ↑ Samantha Masunaga (Oct 11, 2019). "Stratolaunch gets a mysterious new owner, a year after Paul Allen's death". LA Times. https://www.latimes.com/business/la-fi-stratolaunch-shuts-down-20190603-story.html.
30. ↑ Boyle, Alan (30 March 2020). "Stratolaunch resurrects its hypersonic rocket vehicle under a new name: Talon-A". GeekWire. https://www.geekwire.com/2020/stratolaunch-resurrects-hypersonic-rocket-vehicle-new-name-talon/.
31. ↑ Broadbent, Mike (June 2021). "'Roc' airborne again". Air International 100 (6): 7. ISSN 0306-5634.
32. ↑ "Stratolaunch plane flies again as company prepares for hypersonic tests". January 17, 2022. https://spacenews.com/stratolaunch-plane-flies-again-as-company-prepares-for-hypersonic-tests/.
33. ↑ (in en) (video) Stratolaunch Talon-A Captive Carry Test Flight, NASASpaceFlight.com, October 28, 2022, https://www.youtube.com/watch?v=HmrgfT7P8cw, retrieved January 7, 2023, "Stratolaunch's aircraft, named Roc, is conducting its eighth test flight"
34. ↑ "Stratolaunch Completes First Flight with Talon-A Separation Vehicle" (in en). https://www.stratolaunch.com/news/stratolaunch-completes-first-flight-with-talon-a-separation-vehicle/.
35. ↑ @Stratolaunch (January 13, 2023). "Roc completed its flight at 2:51 p.m. setting a new record for the longest flight to date at six hours and marking our first time flying outside of the Mojave range!" (in en). https://twitter.com/Stratolaunch/status/1614037876945068032.
36. ↑ Stratolaunch. "Stratolaunch Completes Second Captive Carry Flight with TA-0 Test Vehicle". www.prnewswire.com (Press release). Retrieved 2023-04-02.
37. ↑ Jeff Foust (June 20, 2016). "Inside Stratolaunch". SpaceNews. http://www.thespacereview.com/article/3012/1.
38. ↑ 38.0 38.1 38.2 38.3 Dominic Gates (May 31, 2017). "Paul Allen's colossal Stratolaunch plane emerges from its lair". Seattle Times. http://www.seattletimes.com/business/boeing-aerospace/allens-colossal-stratolaunch-plane-emerges-from-its-lair/.
39. ↑ Tulis, David (December 19, 2017). "Scaled Composites-designed Stratolaunch taxis". Aircraft Owners and Pilots Association. https://www.aopa.org/news-and-media/all-news/2017/december/19/immense-mother-ship-stratolaunch-taxis.
40. ↑ Masunaga, Samantha (June 20, 2016). "The Stratolaunch is huge, but it's not the strangest aircraft ever built in Southern California". https://www.latimes.com/business/la-fi-socal-aircraft-20160620-snap-htmlstory.html.
41. ↑ 41.0 41.1 41.2 41.3 "Stratolaunch Aims To Restart Flight Tests In Early 2021". Aviation Week. October 16, 2020. https://aviationweek.com/aerospace/commercial-space/stratolaunch-aims-restart-flight-tests-early-2021.
42. ↑ Stratolaunch Systems (December 13, 2011). "Paul G. Allen Announces Revolution in Space Transportation". National Space Society: p. 10. https://space.nss.org/media/Stratolaunch-PressKit-FAQ.pdf.
43. ↑ 43.0 43.1 "Get the Latest From Stratolaunch". https://www.stratolaunch.com/vehicles/carrier.
44. ↑ 44.0 44.1 "Type Certificate Number E24NE data sheet". FAA. November 23, 2015. http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/2a822313bea2157886257f060055beb1/$FILE/E24NE_Rev_13.pdf.
45. ↑ Dickerson, Kelly (October 6, 2014). "Private Dream Chaser Space Plane May Launch from Giant Aircraft" (in en). https://www.space.com/27349-dream-chaser-space-plane-stratolaunch.html.
46. ↑ Whitfield, Bethany (October 2, 2014). "Dream Chaser Teams with Stratolaunch to Carry People into Space" (in en). https://www.flyingmag.com/aircraft/dream-chaser-teams-stratolaunch-carry-people-space.
47. ↑ "The World's Largest Plane's First Flight From Every Angle". Popular Mechanics. 15 April 2019. https://www.popularmechanics.com/flight/airlines/a27148543/stratolaunch-first-flight-video-images/. "The tests come after a long series of taxi tests that always stopped just short of achieving actual flight, but now that threshold has been crossed, and the engineers seem pleased with the results."
48. ↑ "STRATOLAUNCH, THE WORLD'S BIGGEST AIRPLANE, TAKES FLIGHT". Condé Nast Wired. 13 April 2019. https://www.wired.com/story/stratolaunch-flight/. "eight years in the making. By 2022, the company hopes to use the twin-fuselage, six-engined, catamaran-style aircraft to launch satellite-bearing rockets into space."
49. ↑ "Projects". Scaled Composites. http://www.scaled.com/projects.

## External links

* Original Video – Animation of Stratolaunch with SpaceX Falcon 9 Air launch vehicle, December 2011.
* Stratolaunch First Flight, with landing, Stratolaunch Systems, April 2019.
* Stratolaunch Systems, A Paul G. Allen Project. YouTube. Vulcan Inc. December 13, 2011.
* Stratolaunch Systems Press Conference. YouTube. Ian Benecken. December 13, 2011.
* W.J. Hennigan (December 14, 2011). "Paul Allen to build behemoth plane for space launches". The Los Angeles Times. http://articles.latimes.com/2011/dec/14/business/la-fi-paul-allen-spaceship-20111214.
* Guy Norris (February 25, 2015). "Inside The Roc's Lair". Aviation Week. http://aviationweek.com/blog/inside-rocs-lair.

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