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  2. Boeing X-48 - Wikipedia

    en.wikipedia.org/wiki/Boeing_X-48

    The Boeing X-48 is an American experimental unmanned aerial vehicle (UAV) built to investigate the characteristics of blended wing body (BWB) aircraft. Boeing designed the X-48 and two examples were built by Cranfield Aerospace in the UK. Boeing began flight testing the X-48B version for NASA in 2007. The X-48B was later modified into the X-48C ...

  3. Boeing X-66 - Wikipedia

    en.wikipedia.org/wiki/Boeing_X-66

    The Boeing X-66 is an experimental airliner under development by Boeing. It is part of the X-plane series, and is being developed in collaboration with NASA and its Sustainable Flight Demonstrator program. It will use an extra-long and thin wing design stabilized by diagonal bracing struts, which is known as a Transonic Truss-Braced Wing.

  4. Low-cycle fatigue - Wikipedia

    en.wikipedia.org/wiki/Low-cycle_fatigue

    Low cycle fatigue (LCF) has two fundamental characteristics: plastic deformation in each cycle; and low cycle phenomenon, in which the materials have finite endurance for this type of load. The term cycle refers to repeated applications of stress that lead to eventual fatigue and failure; low-cycle pertains to a long period between applications.

  5. Lockheed Martin X-44 MANTA - Wikipedia

    en.wikipedia.org/wiki/Lockheed_Martin_X-44_MANTA

    The X-44 design had a reduced radar signature (due to lack of tail and vertical stabilizers) and was made more efficient by eliminating the tail and rudder surfaces, and instead using thrust vectors to provide yaw, pitch and roll control. [1] The X-44 MANTA design was based on the F-22. The engine and fuselage would be carried over to the X-44.

  6. Martin Marietta X-24 - Wikipedia

    en.wikipedia.org/wiki/Martin_Marietta_X-24

    X-24 The X-24B in flight General information Type Lifting body National origin United States Manufacturer Martin Marietta Primary users United States Air Force NASA Number built 1 (X-24A, rebuilt as X-24B) History First flight 17 April 1969 (X-24A) 1 August 1973 (X-24B) Retired 26 November 1975 Developed from X-23 PRIME The Martin Marietta X-24 was an American experimental aircraft developed ...

  7. Piasecki X-49 SpeedHawk - Wikipedia

    en.wikipedia.org/wiki/Piasecki_X-49_SpeedHawk

    The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft. The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk , but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings.

  8. Bell X-22 - Wikipedia

    en.wikipedia.org/wiki/Bell_X-22

    The Bell X-22 is an American V/STOL X-plane with four tilting ducted fans. Takeoff was to selectively occur either with the propellers tilted vertically upwards, or on a short runway with the nacelles tilted forward at approximately 45°. Additionally, the X-22 was to provide more insight into the tactical application of vertical takeoff troop ...

  9. Rockwell-MBB X-31 - Wikipedia

    en.wikipedia.org/wiki/Rockwell-MBB_X-31

    The Rockwell-Messerschmitt-Bölkow-Blohm X-31 is an experimental jet aircraft designed to test fighter thrust vectoring technology. It was designed and built by Rockwell and Messerschmitt-Bölkow-Blohm (MBB), as part of a joint US and German Enhanced Fighter Maneuverability program to provide additional control authority in pitch and yaw, for significantly more maneuverability than most ...

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