Scaled Composites White Knight
|White Knight One|
|National origin||United States|
|First flight||August 1, 2002|
|Developed from||Scaled Composites Proteus|
|Variants||Scaled Composites White Knight Two|
The Scaled Composites Model 318 White Knight (now also called White Knight One) is a jet-powered carrier aircraft used to launch the Scaled Composites SpaceShipOne experimental spacecraft. It was developed by Scaled Composites as part of its Tier One program. The aircraft is subsequently being offered by Scaled on a contract basis as a research testbed, and was also used for drop tests of the Boeing X-37 spaceplane from June 2005 until April 2006. It is also the predecessor to White Knight Two which added a "one" to its name to tell the two apart.
Design and development
The White Knight carrier airplane was designed around the twin afterburning J-85 engines, which were selected for their availability and low cost. The aircraft was a completely new independent design. White Knight and SpaceShipOne shared the same forward fuselage outer mold line (OML) to reduce development costs and with the original intent to allow for White Knight to act as a flying simulator for training SpaceShipOne pilots. White Knight first flew on August 1, 2002. The flight was aborted shortly after takeoff due to a problem with the outboard wing spoilers. These trailing edge spoilers were designed to greatly increase the glide slope so that the White Knight vehicle could act as a flying simulator for training of SpaceShipOne pilots. During the first flight, the mechanical over-center torque was insufficient to maintain the spoilers in the closed position. The spoilers deployed into the free stream and began a limit cycle forcing the pilot (Mike Melvill) to abort. The spoilers were subsequently disabled completely and the desire for a steep glide slope matching SpaceShipOne was abandoned.
White Knight next flew on August 5, 2002, and this time performed well. Development proceeded over the next few months. With White Knight developed and evaluated, on April 18, 2003, White Knight and SpaceShipOne were presented to the media.
Subsequently, White Knight flew as part of the Tier One program that won the Ansari X Prize on 2004 October 4. Afterwards, White Knight was used to carry and launch DARPA's experimental X-37 spaceplane for its approach and landing tests in 2005 and 2006.
It was followed up by the White Knight Two, which has a similar but larger design.
Flights of White Knight are numbered, starting with flight 1 on August 1, 2002. Flights where SpaceShipOne was carried also get one or two appended letters. An appended "C" indicates that the flight was a captive carry, and "L" indicates that SpaceShipOne was launched. If the flight actually flown differs in category from the intended flight, then two letters are appended, the first giving the intended mission and the second the mission actually performed.
|Flight||Date||SS1 Pilot||SpaceShipOne flight|
|24C||May 20, 2003||Peter Siebold||01C|
|29C||July 29, 2003||Brian Binnie||02C|
|30L||August 7, 2003||Brian Binnie||03G|
|31LC||August 27, 2003||Brian Binnie||04GC|
|32L||August 27, 2003||Brian Binnie||05G|
|37L||September 23, 2003||Peter Siebold||06G|
|38L||October 17, 2003||Peter Siebold||07G|
|40L||November 14, 2003||Brian Binnie||08G|
|41L||November 19, 2003||Brian Binnie||09G|
|42L||December 4, 2003||Peter Siebold||10G|
|43L||December 17, 2003||Peter Siebold||11P|
|49L||March 11, 2004||Brian Binnie||12G|
|53L||April 8, 2004||Brian Binnie||13P|
|56L||May 13, 2004||Brian Binnie||14P|
|60L||June 21, 2004||Mike Melvill||15P|
|65L||September 29, 2004||Mike Melvill||16P|
|66L||October 4, 2004||Brian Binnie||17P|
X-37 test program
White Knight was contracted to perform both captive carry and drop test flights of the DARPA/Boeing X-37. First captive carry flight was on June 21, 2005, and first drop was on April 7, 2006 (the X-37 was subsequently damaged on landing at Edwards AFB). Initially, the flights originated from Mojave, but following the landing incident, the program was moved to Air Force Plant 42 in Palmdale, California, and at least five subsequent flights were made there.
Adaptive Compliant Wing test program
In late 2006, White Knight flew a seven-flight test program of the Adaptive Compliant Wing developed by FlexSys Inc with funding by the Air Force Research Laboratory. A laminar flow test article was mounted vertically under White Knight's centerline pylon for the 20-flight-hour research program that tested the flexible wing's aerodynamic characteristics.
Specifications (White Knight)
Data from Scaled Composites
- Crew: 2
- Capacity: 8,000 lb (3,600 kg) payload
- Wingspan: 82 ft 0 in (25 m)
- Fuel capacity: 6,400 lb (2,900 kg)
- Powerplant: 2 × General Electric J85-GE-5 after-burning turbojet, 2,400 lbf (11 kN) thrust each dry, 3,600 lbf (16 kN) with afterburner
- Service ceiling: 52,000 ft (16,000 m) +
- Carriage and launch of payloads up to 7,000 lbs
- Altitude capability above 53,000 ft
- Large, three-place cabin (60” diameter outside, 59” inside)
- Sea level cabin qualified for unlimited altitude
- ECS scrubs CO2, removes humidity and defogs windows
- Two crew doors with dual seals and dual-pane windows
- Manual flight controls with three-axis electric trim
- Avionics include INS-GPS navigator, flight-director, flight test data (recording and T/M), air-data, vehicle health monitoring, backup flight instruments, and video system
- The 82 ft wing can be extended to 93 ft for increased climb capability
- Super-effective, pneumatic speed brakes allow steep descent with L/D < 4.5
- Hydraulic wheel brakes and nose-gear steering
- Pneumatic main gear retraction
- Dual-bus electrical power system
- Cockpit allows single-pilot operation (VMC-day conditions only)
- Scott, William B, "Morphing Wings", Aviation Week & Space Technology, 2006-11-27
- Scott, William B, "White Knight Back in Action", Aviation Week & Space Technology, 2006-11-27
|Wikimedia Commons has media related to White Knight.|
- Scaled Composites' Tier One website
- White Knight's FAA registration
- WhiteKnight to launch X-37 test flights
|This aircraft article is missing some (or all) of its specifications. If you have a source, you can help Wikipedia by adding them.|