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  #1  
Old 12-22-2006, 05:45 PM
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Boeing X-36

1994 Boeing X-36 #1

McDonnell Douglas and NASA embarked on a joint project in 1994 to develop a prototype fighter aircraft designed for stealth and agility. The result is a subscale tailless aircraft called the X-36. The 28 percent scale, remotely piloted X-36 has no vertical or horizontal tails, yet it is expected to be more maneuerable and agile than todays fighters. In addition, the tailless design reduces the weight, drag, and radar cross section typically associated with traditional fighter aircraft.
Using a video camera in the nose of the vehicle, a pilot controls the flight of the X-36 from a virtual cockpit -- complete with head-up display (HUD) -- in a ground-based station. This pilot-in-the-loop approach eliminates the need for expensive and complex autonomous flight control systems.
Fully fueled, the X-36 prototype weighs 1,300 pounds. It is 19 feet long and measures 11 feet at its widest point. It is 3 feet high and is powered by a Williams Research F112 engine that provides about 700 pounds of thrust.
In a series of upcoming flight tests, the low-cost X-36 research vehicle will demonstrate the feasibility of using new flight control technologies in place of vertical and horizontal tails to improve the maneuverability and survivability of future fighter aircraft. During flight, the X-36 will use new split ailerons and a thrust-vectoring nozzle for directional control. The ailerons not only split to provide yaw (left and right) control, but also raise and lower asymmetrically to provide roll control.
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File Type: jpg BoeingX-36a1.jpg (635.3 KB, 46 views)
File Type: jpg BoeingX-36b.jpg (774.9 KB, 38 views)
File Type: jpg BoeingX-36c1.jpg (643.4 KB, 23 views)
File Type: jpg BoeingX-36d.jpg (817.8 KB, 22 views)
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  #2  
Old 12-22-2006, 07:16 PM
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1994 Boeing X-36 #2

The NASA/Boeing X-36 Tailless Fighter Agility Research Aircraft program successfully demonstrated the tailless fighter design using advanced technologies to improve the maneuverability and survivability of possible future fighter aircraft. The program met or exceeded all project goals.
For 31 flights during 1997 at the Dryden Flight Research Center, Edwards, California, the project team examined the aircraft’s agility at low speed / high angles of attack and at high speed / low angles of attack. The aircraft’s speed envelope reached up to 206 knots (234 mph). This aircraft was very stable and maneuverable. It handled very well.
The X-36 vehicle was designed to fly without the traditional tail surfaces common on most aircraft. Instead, a canard forward of the wing was used as well as split ailerons and an advanced thrust-vectoring nozzle for directional control. The X-36 was unstable in both pitch and yaw axes, so an advanced, single-channel digital fly-by-wire control system (developed with some commercially available components) was put in place to stabilize the aircraft.
Using a video camera mounted in the nose of the aircraft and an onboard microphone, the X-36 was remotely controlled by a pilot in a ground station virtual cockpit. A standard fighter-type head-up display (HUD) and a moving-map representation of the vehicle’s position within the range in which it flew provided excellent situational awareness for the pilot. This pilot-in-the-loop approach eliminated the need for expensive and complex autonomous flight control systems and the risks associated with their inability to deal with unknown or unforeseen phenomena in flight.
Fully fueled the X-36 prototype weighed approximately 1,250 pounds. It was 19 feet long and three feet high with a wingspan of just over 10 feet. A Williams International F112 turbofan engine provided close to 700 pounds of thrust. A typical research flight lasted 35 to 45 minutes from takeoff to touchdown. A total of 31 successful research flights were flown from May 17, 1997, to November 12, 1997, amassing 15 hours and 38 minutes of flight time. The aircraft reached an altitude of 20,200 feet and a maximum angle of attack of 40 degrees.
In a follow-on effort, the Air Force Research Laboratory (AFRL), Wright-Patterson Air Force Base, Ohio, contracted with Boeing to fly AFRL's Reconfigurable Control for Tailless Fighter Aircraft (RESTORE) software as a demonstration of the adaptability of the neural-net algorithm to compensate for in-flight damage or malfunction of effectors, such as flaps, ailerons and rudders. Two RESTORE research flights were flown in December 1998, proving the viability of the software approach.
The X-36 aircraft flown at the Dryden Flight Research Center in 1997 was a 28-percent scale representation of a theoretical advanced fighter aircraft. The Boeing Phantom Works (formerly McDonnell Douglas) in St. Louis, Missouri, built two of the vehicles in a cooperative agreement with the Ames Research Center, Moffett Field, California.
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File Type: jpg EC96-43641-6.jpg (560.2 KB, 15 views)
File Type: jpg EC96-43641-9.jpg (610.4 KB, 17 views)
File Type: jpg EC97-44064-3.jpg (564.7 KB, 11 views)
File Type: jpg EC97-44064-11.jpg (714.0 KB, 19 views)
File Type: jpg EC97-44064-12.jpg (814.1 KB, 16 views)
File Type: jpg EC97-44121-24.jpg (767.9 KB, 18 views)
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Old 12-22-2006, 07:23 PM
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1994 Boeing X-36 #3
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File Type: jpg EC97-44165-151.jpg (724.0 KB, 21 views)
File Type: jpg EC97-44294-2.jpg (687.0 KB, 18 views)
File Type: jpg EC97-44294-4.jpg (566.2 KB, 14 views)
File Type: jpg EC97-44294-12.jpg (482.8 KB, 12 views)
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Old 12-22-2006, 07:25 PM
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1994 Boeing X-36 #4
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  #5  
Old 12-22-2006, 08:25 PM
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they can actually get that thing to basically slide a 360 and keep on flyin.
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Old 12-22-2006, 10:29 PM
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Quote:
Originally Posted by cmcpokey
they can actually get that thing to basically slide a 360 and keep on flyin.
You mean like how the Su-35 Flanker can?
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