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The Lockheed Martin X-56 is an American modular unmanned aerial vehicle that is being designed to explore High-Altitude Long Endurance (HALE) flight technologies for use in future military unmanned reconnaissance aircraft.
• Aircraft typically carry around enough structure to keep flutter 15% above the design dive speed (V D), which has margin above the max operating speed (V MO) • Instead, design the wings with less structure and let flutter occur closer to V D and use the control system to provide the airspeed margin from instability.
The maximum level flight speed is 135 kn, and the aircraft can achieve up to 150 kn in a dive. The aircraft carries 82 lb of Jet-A fuel in a tail-mounted fuel tank.
28 Δεκ 2016 · In this 3-minute, 44-second video, engineers at NASA’s Armstrong Flight Research Center examined the X-56 Multi-Use Technology Testbed as the aircraft underwent “moment of inertia” testing ...
Their work proved that flutter behavior can be accurately predicted and addressed through the creation of a new design paradigm of active control. This active control method produced a 75 percent increase in BFF speed, as proven in a series of flight tests. X-56A: Breaking the Flutter Barrier.
23 Ιαν 2014 · Research results from the low-speed sub-scale X-56A will benefit future designs for both subsonic and supersonic aircraft. Objectives. The goal of the X-56A project is to advance aeroservoelastic technology through flight research using a low-cost, modular, remotely piloted aircraft.
•Reduce speed faster –Instability is driven by dynamic pressure so getting it slowed faster would prevent oscillation from growing. –Improved brakes to get maximum braking, pushing the limits to where the wheels are just short of locking up –Attempted a drag parachute however stability and shock loads were of issue and prevented use. ~
