XCOR Lynx

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Lynx
Lynx spaceplane mockup.jpg
Mockup of Lynx spaceplane
Function Manned suborbital launch and reentry
Manufacturer XCOR Aerospace
Size
Stages (none, fully reusable spacecraft)
Boosters
No. boosters 4
Thrust 2,900 pounds
Fuel LOX-Kerosene

The XCOR Lynx was a proposed suborbital horizontal-takeoff, horizontal-landing (HTHL), rocket-powered spaceplane that was under development by the California-based company XCOR Aerospace to compete in the emerging suborbital spaceflight market. The Lynx was intended to carry one pilot, a ticketed passenger, and/or a payload above 100 km altitude. The concept was under development since 2003, when a two-person suborbital spaceplane was announced under the name Xerus.

In January 2016, XCOR changed plans for the first flight of the Lynx spaceplane, initially planned announced for the second quarter of 2016 from the Midland spaceport in Texas,[1] it was pushed to an "undisclosed and tentative" date at the Mojave spaceport in early 2016.[2]

In May 2016,[3] XCOR announced development of the Lynx had been halted with layoffs of approximately one-third of the staff; the company intends to concentrate on development of their liquid hydrogen rocket under contract with United Launch Alliance, instead.[4]

History[edit]

Xerus[edit]

In 2003, XCOR proposed the Xerus (pronunciation: zEr'us) suborbital spaceplane concept. It was to be capable of transporting one pilot and one passenger as well as some science experiments and it would even be capable of carrying an upper stage which would launch near apogee and therefore would potentially be able to carry satellites into low-Earth orbit.[5] As late as 2007, XCOR continued to refer to their future two-person spaceplane concept as Xerus,[6]

Lynx[edit]

The Lynx was initially announced on March 2008, with plans for an operational vehicle within two years.[7] In December 2008 a ticket price of $95,000 per seat was announced, with flights intended to commence in 2010.[8] The build of the Lynx Mark I flight article did not commence until mid 2013 and, as of October 2014 XCOR claimed that the first flight would take place in 2015.[9][10] In July 2015 ticket prices increased by 50% to $150,000.[11] In November 2015, three co-founders left their existing positions with the company to start Agile Aero. Dan DeLong (Chief Engineer) and Aleta Jackson left the company entirely, although Jeff Grearson (CTO) has remained on the board of directors for XCOR.[12] Greason cited problems with the Lynx vehicle body, although the engine had been a success.[12] As of mid 2016, development was suspended in favor of a ULA contracted hydrolox engine, the 8H21.[4]

Passengers who had hoped to make flights in the Lynx included the winners from the Axe Apollo Space Academy worldwide perfume contest, and Justin Dowd of Worcester, Massachusetts, who won[13] Metro International's Race for Space newspaper contest.[14] As of July 2015, the passenger ticket was projected to cost $150,000.[15][16] As of December, 2015, Kayak.com was reportedly selling tickets for flights on the XCOR Lynx starting in 2016.[17]

In May 2016, the company halted development of the Lynx spaceplane and pivoted company focus toward development its LOX/LH2 engine technology, particularly on a funded project for United Launch Alliance. The company laid off more than 20 people of the 50–60 persons onboard prior to May.[4]

Description[edit]

The Lynx was intended to have four liquid rocket engines at the rear of the fuselage burning a mixture of LOX-Kerosene, each engine producing 2,900 pounds-force (13,000 N) of thrust.[18]

Mark I Prototype[edit]

  • Maximum Altitude: 62 km (203,000 ft)[16]
  • Primary Internal Payload: 120 kg (260 lb)[19]
  • Secondary payload spaces include a small area inside the cockpit behind the pilot or outside the vehicle in two areas in the aft fuselage fairing.[19]
  • Aluminum LOX tank
  • Mach 2 (1,522 mph) speed of ascent[20]
  • 4G re-entry loading[20]

Mark II Production Model[edit]

Mark III[edit]

The Lynx Mark III was intended to be the same vehicle as the Mark II with and External Dorsal Mounted Pod of 650 kg (1,430 lb) and was to be large enough to hold a two-stage carrier to launch a microsatellite or multiple nanosatellites into low-Earth orbit.[26]

Lynx XR-5K18 engine[edit]

The XR-5K18 is a piston pump fed LOX/RP-1 engine using an expander cycle.[26] The engine chamber and regenerative nozzle are cooled by RP-1[25][26]

The development program of the XCOR Lynx 5K18 LOX/kerosene engine reached a major milestone in March 2011. Integrated test firings of the engine/nozzle combination demonstrated the ability of the aluminum nozzle to withstand the high temperatures of rocket-engine exhaust.[27]

In March 2011, United Launch Alliance (ULA) announced they had entered into a joint-development contract with XCOR for a flight-ready, 25,000 to 30,000 pounds-force (110,000–130,000 N) cryogenic LH2/LOX upper-stage rocket engine (see XCOR/ULA liquid-hydrogen, upper-stage engine development project). The Lynx 5K18 effort to develop a new aluminum alloy engine nozzle using new manufacturing techniques would remove several hundred pounds of weight from the large engine leading to significantly lower-cost and more-capable commercial and US government space flights.[28]

Airframe[edit]

It was reported in 2010 that the Mark I airframe could use a carbon/epoxy ester composite, and the Mark II a carbon/cyanate with a nickel alloy for the nose and leading-edge thermal protection.[29]

Mark I build[edit]

The flight article Lynx Mark I was claimed as being fabricated and assembled in Mojave beginning in mid 2013.[30] The cockpit of the Lynx (made of carbon fibre and designed by AdamWorks, Colorado) was reported as being one of the items that held up the assembly.[19]

At the start of October 2014, the cockpit was attached to the fuselage.[31] The rear carry-through spar was attached to the fuselage shortly after Thanksgiving 2014.[32] At the beginning of May 2015, the strakes were attached to the airframe.[33] The last major component, the wings, were expected to be delivered in late 2015.[34] In January 2016 XCOR's CEO Jay Gibson said "...we anticipate the wings to be there in the very near future..." and the CTO Michael Valant said they were finding that calibrating the flaps was a challenge.[35] In February 2016 the first prototype was described as a "wingless shell."[36]

Test program[edit]

Tests of the XR-5K18 main engine began in 2008.[37]

In February 2011, it was reported that engine tests were largely complete[23] and the vehicle aerodynamic design had completed two rounds of wind tunnel testing. A third and final round of tests was completed in late 2011 using a "1/60-scale supersonic wind tunnel model of Lynx."[20][23]

In October 2014, XCOR claimed that flight tests of the Mark I prototype would start in 2015.[9][10][38] However, by January 2016, technical hurdles led the company to state that they had not assigned a new projected date for test flights.[35]

Concept of operations[edit]

NASA sRLV program[edit]

In March 2011, XCOR submitted the Lynx as a reusable launch vehicle for carrying research payloads in response to NASA's suborbital reusable launch vehicle (sRLV) solicitation, which is a part of NASA's Flight Opportunities Program.[39] No contract for providing this was ever announced.

Commercial operations[edit]

According to XCOR, the Lynx was intended to fly four or more times a day, and would have also had the capacity to deliver payloads into space. The Lynx Mark I prototype was expected to perform its first test flight in 2015,[10][15][40] followed by a flight of the Mark II production model twelve to eighteen months afterwards.[10]

XCOR had planned to have the Lynx's initial flights at the Mojave Air and Spaceport in Mojave, California[41] or any licensed spaceport with a 2,400 meter (7900 ft) runway. Media reports in 2014 anticipated that by the end of 2015[42] or in 2016[15] the Lynx was expected to begin flying suborbital space tourism flights and scientific research missions from a new spaceport on the Caribbean island of Curaçao.[43][44][45] However, the company stated in January 2016 that they had not assigned a new projected date for test flights and a date for the launch of commercial operations could not be anticipated.[35]

Because it lacked any propulsion system other than its rocket engines, the Lynx would have to be towed to the end of the runway. Once positioned on the runway, the pilot would have ignited the four rocket engines, take-off and begin a steep climb. The engines will be shut off at approximately 138,000 feet (42 km) and Mach 2. The spaceplane would then continue to climb, unpowered until it reached an apogee of approximately 200,000 feet (61 km). The spacecraft would have experienced a little over four minutes of weightlessness, before re-entering the Earth's atmosphere. The occupants of the Lynx were intended to have experienced up to four times normal gravity during re-entry. After re-entry, the Lynx would have glided down and performed an unpowered landing. The total flight time was projected to last about 30 minutes.[26] The Lynx was expected to be able to perform 40 flights before maintenance wass required.

As of March 2011, Orbital Outfitters was reportedly designing pressure suits for XCOR use.[46][dated info]. In 2012, Orbital Outfitters reported that they had completed a technical mockup of the Lynx craft itself.[47]

As of 2012, the successor to the Mark II might have been a two-stage, fully reusable orbital vehicle that took off and landed horizontally.[48]

Development cost projections[edit]

In 2008 Mark I production was projected to cost US$10 million,[49][50] and the Mark II around US$12 million.[51]

See also[edit]

References[edit]

  1. ^ "MSDC president: Lynx will launch from Midland this fiscal year". MRT.com. Retrieved 31 October 2015. 
  2. ^ "XCOR officials refrain from disclosing date for Lynx test flights". Midland Reporter-Telegram. 17 January 2016. Retrieved 12 March 2016. 
  3. ^ "The XCOR Lynx Spaceplane Might Be Down for the Count". 31 May 2016. Retrieved 2 June 2016. 
  4. ^ a b c Foust, Jeff (2016-05-31). "XCOR lays off employees to focus on engine development". SpaceNews. Retrieved 2016-07-13. has decided to focus the majority of its resources on the final development of the revolutionary liquid oxygen and liquid hydrogen (LH2) program. This innovative propulsion technology has applications to upper stage liquid hydrogen engines suitable for the Atlas V, Delta IV, and the planned NASA Space Launch System (SLS). ... XCOR’s problem is — and has always been — funding. There wasn’t enough of it to keep the Lynx staff.  
  5. ^ Space.com: XCOR Zeroes in on Xerus Archived December 8, 2009, at the Wayback Machine., space.com, 2003-05-19, accessed 2011-01-04.
  6. ^ David, Leonard (2007-04-23). "XCOR Pursues Dream a Step at a Time". Space.com. Retrieved 2013-10-21. 
  7. ^ "XCOR AEROSPACE SUBORBITAL VEHICLE TO FLY WITHIN TWO YEARS". XCOR. 26 March 2008. Archived from the original on May 9, 2008. Retrieved 4 December 2013. 
  8. ^ "Rocket company offers $95,000 trips to space". New Space/Reuters. 2 December 2008. Retrieved 21 July 2015. 
  9. ^ a b Schilling, Govert (September 16, 2013). "Lynx Space Plane Taking Off: Q&A with XCOR Aerospace CEO Jeff Greason". Space.com. Retrieved October 23, 2013. 
  10. ^ a b c d Norris, Guy (8 October 2014) XCOR Lynx Moves Into Final Assembly Aviation Week, Retrieved 20 January 2015
  11. ^ "XCOR to Hike Ticket Prices 50 Percent". Parabolic Arc. July 2015. Retrieved 20 November 2015. 
  12. ^ a b Foust, Jeff (30 November 2015). "XCOR Co-Founders Establish New Company". Space News. Retrieved 8 March 2016. 
  13. ^ METRO WORLD NEWS (13 October 2014). "America’s Justin Dowd wins Metro's Race for Space". Metro. Retrieved 28 June 2015. 
  14. ^ "Race for Space". metroinspace.com. Archived from the original on 13 June 2013. Retrieved 31 October 2015. 
  15. ^ a b c Woollaston, Victoria (14 March 2014) 'Budget' XCOR space trip set to launch in 2016 will let you pilot the ship for £57,000 Daily Mail, Retrieved 26 October 2014
  16. ^ a b c Belfiore, Michael. "XCOR Lynx: Don't Sleep on the Space Corvette". Popular Mechanics. Retrieved 2 October 2012. 
  17. ^ Foxnews.com (14 Dec 2015). "Kayak starts booking space flights". foxnews.com. Retrieved 16 Dec 2015. 
  18. ^ "Rocket Test Paves Way For XCOR Lynx Flights". Aviation Week. 28 March 2013. Retrieved 8 November 2013. 
  19. ^ a b c Belfore. Michael (November 2013) "The Lynx’s Leap, Can a suborbital spaceship help XCOR reach orbit?" Air & Space Magazine, Smithsonian, Retrieved 14 October 2013
  20. ^ a b c Joiner, Stephen (2011-05-01). "The Mojave Launch Lab". Air & Space Smithsonian. Retrieved 2013-11-03. 
  21. ^ a b Spark, Joel (2 March 2012). "XCOR, Southwest Research Institute Move Up Suborbital Payload Testing". Space Safety Magazine. Retrieved 4 December 2013. 
  22. ^ "XCOR Aerospace Lynx". Zap 16. 2011-12-30. Retrieved 2014-06-27. 
  23. ^ a b c Foust, Jeff (2011-02-28). "Suborbital back out of the shadows". The Space Review. Retrieved 2011-02-28. the 5K18 engine, four of which will power the Lynx ... the last few technical milestones for the engine are largely complete. ... non-toxic reaction control system (RCS) thrusters, a project that Greason said was more challenging in some respects than the larger main engine, but critical to the company’s vision of rapid turnaround times that would not be possible if conventional hydrazine RCS systems are used. The Lynx design has been through two rounds of wind tunnel tests, with a final round planned for later this year for some final tweaks 
  24. ^ "A Spaceplane Is Born". MoonandBack. 2013-09-30. Retrieved 2014-05-01. 
  25. ^ a b "Lee Valentine on How XCOR Will Open Up Space". parabolicarc.com. March 19, 2012. 
  26. ^ a b c d "XCOR Aerospace’s multi-talented Lynx spaceplane set for KSC". nasaspaceflight.com. August 27, 2012. Retrieved May 1, 2014. 
  27. ^ "Demo'd is a revolutionary rocket engine nozzle and a new engine development partnership". Satnews. 2011-03-22. Retrieved 2014-06-27. 
  28. ^ Morring, Frank, Jr. (2011-03-23). "ULA, XCOR to Develop Upper-Stage Engine". Aviation Week. Retrieved 2011-03-25. United Launch Alliance (ULA) and XCOR Aerospace are planning a joint effort to develop a low-cost upper-stage engine in the same class as the venerable RL-10, using technology XCOR is developing for its planned Lynx suborbital spaceplane. The two companies have been testing actively cooled aluminum nozzles XCOR is developing for its liquid oxygen/kerosene 5K18 engine for the Lynx, a reusable two-seat piloted vehicle the company plans to use for commercial research and tourist flights. 
  29. ^ "The Private Space Race". compositesworld.com. 2010-08-31. 
  30. ^ Messier, Doug (2013-09-19). "XCOR Follow the Build Looks at Subsonic Wind Tunnel Testing". Parabolic Arc. Retrieved 2013-10-12. 
  31. ^ James Dean (10 October 2014). "XCOR installs cockpit into Lynx space place". Florida Today. 
  32. ^ "XCOR Lynx suborbital spacecraft nears final assembly". Composites World. 23 December 2014. 
  33. ^ "XCOR Aerospace Announces Strakes Bonded to Lynx Mark I Spacecraft". SpaceRef. 8 May 2015. 
  34. ^ Jeff Foust (22 July 2015). "XCOR To Raise Ticket Prices for Suborbital Flights". Space News. 
  35. ^ a b c "XCOR officials refrain from disclosing date for Lynx test flights". Midland Reporter-Telegram. January 17, 2016. 
  36. ^ Wall, Mike (2016-04-05). "Private Lynx Space Plane Could Take Off in Early 2017". Space.com. Retrieved 2016-06-02. 
  37. ^ Keith Cowing (December 17, 2008). "Successful First Test Fire of Engine for Lynx Suborbital Launch Vehicle". NASA Watch. 
  38. ^ "The Age of Space Flights is about to begin". flyfighterjet.com. 2013-10-12. 
  39. ^ "sRLV platforms compared". NASA. 2011-03-07. Retrieved 2011-03-10. Lynx: Type: HTHL/Piloted 
  40. ^ Belfiore, Michael, (9 January 2013) Lynx Rocket Plane Readying for Summer Flight Moon and Back, Retrieved 5 April 2013
  41. ^ "XCOR Unveils New Suborbital Rocketship". SPACE.com. 
  42. ^ Nilsson, Eric and Zhangyu, Deng (25 October 2014) "The Final Frontier" Daily Telegraph supplement "China Watch" Page 1
  43. ^ (2012) SXC - Buying your tickets into space! Archived March 6, 2013, at the Wayback Machine. SXC web page, Retrieved 5 April 2013
  44. ^ Staff writers (October 6, 2010). "Space Expedition Corporation Announces Wet Lease of XCOR Lynx Suborbital". Space Media Network Promotions. Space-Travel.com. Retrieved 2010-10-06. 
  45. ^ "Space Experience Curacao". Home. Space Experience Curacao. 2009–2010. Retrieved 2010-10-06. 
  46. ^ "Commercial Spacesuit Companies Compete for Market Share". Parabolic Arc. March 21, 2011. Retrieved October 30, 2013. 
  47. ^ "XCOR Lynx Technical Mockup Unveiled". Orbital Outfitters. July 14, 2012. 
  48. ^ "The Next Frontier: An Interview with Lee Valentine". 30 November 2012. Retrieved 29 June 2015. 
  49. ^ ANDY PASZTOR (March 26, 2008). "Economy Fare ( $100,000) Lifts Space-Tourism Race". wsj.com. 
  50. ^ John Antczak (2008-03-27). "New rocket aims for space tourism market". msnbc.msn.com. 
  51. ^ Jeff Foust (March 31, 2008). "One size may not fit all". thespacereview.com. 

External links[edit]