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Lockheed Martin X-59 QueSST

From Wikipedia, the free encyclopedia

X-59 QueSST
Low-Boom Flight Demonstrator.jpg
Low-Boom Flight Demonstrator
Role Experimental supersonic aircraft
National origin United States
Manufacturer Lockheed Martin
Built by Lockheed Martin
First flight Planned: 2021 to early 2022.[1]
Introduction Planned: 2022[2]
Primary user NASA
Program cost $247.5M[2]

The Lockheed Martin X-59 QueSST ("Quiet Supersonic Transport") is an American experimental supersonic aircraft being developed at Skunk Works for NASA's Low-Boom Flight Demonstrator program.[3] Preliminary design started in February 2016, with the X-59 scheduled for delivery in late 2021 for flight tests from 2022. It is expected to cruise at Mach 1.42 (1,510 km/h; 937 mph) and 55,000 ft (16,800 m), creating a low 75 Perceived Level decibel (PLdB) thump to evaluate supersonic transport acceptability.

Development

A model in a wind tunnel at NASA Langley, September 2017
A model in a wind tunnel at NASA Langley, September 2017

In February 2016, Lockheed Martin was awarded a preliminary design contract, aiming to fly in the 2020 timeframe.[4] A 9% scale model was to be wind tunnel tested from Mach 0.3 to Mach 1.6 between February and April 2017.[5] The Preliminary design review was to be completed by June 2017.[6] While NASA received three inquiries for its August 2017 request for proposals, Lockheed was the sole bidder.[7]

On April 2, 2018, NASA awarded Lockheed Martin a $247.5 million contract to design, build and deliver in late 2021 the Low-Boom X-plane. On June 26, 2018, the US Air Force informed NASA it had assigned the X-59 QueSST designation to the demonstrator.[8] By October, NASA Langley had completed three weeks of wind tunnel testing of an 8%-scale model, with high AOAs up to 50° and 88° at very low speed, up from 13° in previous tunnel campaigns.[9] Testing was for static stability and control, dynamic forced oscillations, and laser flow visualization, expanding on previous experimental and computational predictions.[10]

From November 5, 2018 NASA was to begin tests over two weeks to gather feedback: up to eight thumps a day at different locations will be monitored by 20 noise sensors and described by 400 residents, receiving a $25 per week compensation. To simulate the thump, an F/A-18 is diving from 50,000 ft to briefly go supersonic for reduced shock waves over Galveston, Texas, an island, and a stronger boom over water.[11] By then, Lockheed Martin had begun milling the first part in Palmdale, California.[12]

In May 2019, the initial major structural parts were loaded in the tooling assembly.[1] In June, assembly was getting underway.[13] The external vision system (XVS) was flight tested on a King Air at NASA Langley.[14] This will be followed by high speed wind tunnel tests to verify inlet performance predictions with a 9.5%-scale model at NASA Glenn Research Center. The critical design review was successfully held on September 9–13, before the IRB report to NASA's Integrated Aviation Systems Program by November.[15] Then, 80-90% of the drawings should be released to engineering.[1] The wing assembly should be completed in 2020.[13] The first flight is planned for 2021, with schedule reserve until early 2022.[1]

After flight-clearance testing at the Armstrong Flight Research Center, an acoustic validation will include air-to-air Schlieren imaging backlit by the Sun to confirm the shockwave pattern until September 2022.[7] NASA will then flight test it to verify its safety and performance, and to prove the quiet supersonic technology from mid-2022 over U.S. cities to evaluate community responses for regulators, which could enable commercial supersonic travel.[2] Community-response flight tests in 2023-25 will be used for ICAO's Committee on Aviation Environmental Protection meeting (CAEP13) establishing a sonic boom standard in 2025.[7]

Design

The Low-Boom X-plane will be 94 ft (29 m) long with a 29.5 ft (9.0 m) wingspan for a max takeoff weight of 32,300 lb (14,700 kg). Propelled by a single General Electric F414, it should reach Mach 1.5 or 990 mph (1,590 km/h), and cruise at Mach 1.42 or 940 mph (1,510 km/h) at 55,000 ft (16,800 m).[16] The cockpit, ejection seat and canopy come from a Northrop T-38 and the landing gear from an F-16.[7] Its engine will provide 22,000 lbf (98 kN) of thrust.[17]

The ground noise is expected to be around 60 dB(A), about 1/1000 as loud as current supersonic aircraft. This is achieved by using a long, narrow airframe and canards to keep the shock waves from coalescing.[6] It should create a 75 Perceived Level decibel (PLdB) thump on ground, as loud as closing a car door, compared with 105-110 PLdB for the Concorde.[7] The central engine has a top-mounted intake for low boom, but inlet flow distortion due to vortices is a concern.[1]

The long and pointed nose-cone will obstruct all forward vision. The X-59 will use an enhanced flight vision system (EVS), consisting of a forward 4K camera with a 33° by 19° angle of view, which will compensate for the lack of forward visibility.[7][18] United Technologies subsidiary Collins Aerospace was selected to supply its Pro Line Fusion Cockpit avionics, displaying the boom on the ground, and EVS with long-wave infrared sensors.[19] The Collins EVS-3600 multispectral imaging system, beneath the nose, is used for landing, while the NASA external vision system (XVS), in front of the cockpit, is giving a forward view.[1]

See also

Related lists

References

  1. ^ a b c d e f Guy Norris (Feb 19, 2019). "Final Testing Will Clear Way For Assembly Of Supersonic X-59A". Aviation Week & Space Technology.
  2. ^ a b c "NASA Awards Contract to Build Quieter Supersonic Aircraft" (Press release). NASA. April 3, 2018.
  3. ^ Gipson, Lillian (8 October 2019). "NASA's Supersonic X-59 QueSST Coming Together at Famed Factory". NASA.
  4. ^ Jim Banke (April 22, 2016). "QueSST - New Era of X-Plane Research". NASA. Archived from the original on February 27, 2017. Retrieved February 26, 2017.
  5. ^ Karen Northon (24 February 2017). "NASA Wind Tunnel Tests X-Plane Design for Quieter Supersonic Jet" (Press release). NASA.
  6. ^ a b Leigh Giangreco (22 March 2017). "Lockheed and NASA move toward design review for supersonic X-plane". Flightglobal.
  7. ^ a b c d e f Graham Warwick and Guy Norris (Apr 4, 2018). "Lockheed To Build NASA's Low-Boom Supersonic X-Plane". Aviation Week & Space Technology.
  8. ^ Jim Banke (28 June 2018). "NASA's experimental supersonic aircraft now known as X-59 QueSST". NASA.
  9. ^ Graham Warwick (Oct 30, 2018). "NASA Wind-Tunnel Tests Mature Low-Boom X-Plane Design". Aviation Week & Space Technology.
  10. ^ Chad Trautvetter (November 6, 2018). "NASA Spools Up Low-boom Supersonic Research". AIN online.
  11. ^ Graham Warwick (Nov 2, 2018). "NASA To Begin Quiet Supersonic Research Flights In Texas". Aviation Week Network.
  12. ^ Garrett Reim (16 Nov 2018). "Lockheed Martin starts work on X-59 Quiet Supersonic aircraft". Flightglobal.
  13. ^ a b Guy Norris (Jun 18, 2019). "Lockheed Martin Begins Assembly Of X-59 Low-Boom Demonstrator". Aviation Week & Space Technology.
  14. ^ Graham Warwick (Sep 23, 2019). "NASA's External Vision System Is Ready For Low-boom Supersonic X-59". Aviation Week & Space Technology.
  15. ^ Graham Warwick (Sep 30, 2019). "The Week In Technology, Sept. 30-Oct. 4, 2019". Aviation Week & Space Technology.
  16. ^ Jim Banke (April 3, 2018). "New NASA X-Plane Construction Begins Now". NASA.
  17. ^ Meredith Bruno (Jun 19, 2018). "Iconic goes supersonic!". GE Aviation.
  18. ^ Trevithick, Joseph (2018-08-23). "NASA's X-59A Quiet Supersonic Test Jet Will Have Zero Forward Visibility For Its Pilot". thedrive.com.
  19. ^ Graham Warwick (Jan 21, 2019). "The Week In Technology, Jan. 21-26, 2019". Aviation Week & Space Technology.

External links

This page was last edited on 6 July 2020, at 06:52
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