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XV-15 tilt rotor aircraft on VTOL stand

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(October 1980) The XV-15 tilt rotor aircraft undergoing tests on the VTOL stand. This allowed the engine and rotor system to undergo realistic testing before being committed to actual free flight. The XV-15s, manufactured by Bell, were involved in limited research at NASA/Dryden in 1980 and 1981. The development of the XV-15 Tiltrotor research aircraft was initiated in 1973 with joint Army/NASA funding as a "proof of concept", or "technology demonstrator" program, with two aircraft being built by Bell Helicopter Textron (BHT) in 1977. NASA Ames Research Center, where most of the NASA research is conducted, continues to be in charge of the joint NASA/Army/Bell program. The aircraft are powered by twin Lycoming T-53 turboshaft engines that are connected by a cross-shaft and drive three-bladed, 25 ft diameter metal rotors (the size extensively tested in a wind tunnel). The engines and main transmissions are located in wingtip nacelles to minimize the operational loads on the cross-shaft system and, with the rotors, tilt as a single unit. For takeoff, the proprotors and their engines are used in the straight-up position where the thrust is directed downward. The XV-15 then climbs vertically into the air like a helicopter. In this VTOL mode, the vehicle can lift off and hover for approximately one hour. Once off the ground, the XV-15 has the ability to fly in one of two different modes. It can fly as a helicopter, in the partially converted airplane mode. The XV-15 can also then convert from the helicopter mode to the airplane mode. This is accomplished by continuous rotation of the proprotors from the helicopter rotor position to the conventional airplane propeller position. During the ten to fifteen second conversion period, the aircraft speed increases and lift is transferred from the rotors to the wing. To land, the proprotors are rotated up to the helicopter rotor position and flown as a helicopter to a vertical landing...Image # : ECN-13840

The X-planes are a series of experimental United States aircraft and rockets, used to test and evaluate new technologies and aerodynamic concepts. They have an X designator, which indicates the research mission within the US system of aircraft designations. The first, the Bell X-1, became well known in 1947 after it became the first aircraft to break the sound barrier in level flight. Most of the X-planes have been operated by the National Advisory Committee for Aeronautics (NACA) or, later, the National Aeronautics and Space Administration (NASA), often in conjunction with the United States Air Force. The majority of X-plane testing has occurred at Edwards Air Force Base. Some of the X-planes have been well publicized, while others have been developed in secrecy. Most X-planes are not expected to go into full-scale production.

NASA Photo Collection

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bell model 301 lycoming t53 aviation lycoming ltc1k 4k bell t53 l 13b aerospace x plane experimental flight national aeronautics and space administration tilt rotor lycoming ltc1k 4k t53 airplane xv 15 bell helicopter bell xv 15 aircraft bell 301 rotary wing xv 15s xv 15 tilt rotor aircraft helicopter rotor position rotors helicopter airplane mode engine proprotors xv 15 tiltrotor research aircraft helicopter mode bell helicopter textron nasa ames research center rotor system vtol nasa research two aircraft vtol mode airplane propeller position propeller aircraft nasa experimental aircraft
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Date

1980
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X Planes

X Series of U.S. Experimental Airplanes

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NASA Photo Collection
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NASA
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https://www.flickr.com/
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label_outline Explore Helicopter Mode, Rotor System, Lycoming

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bell model 301 lycoming t53 aviation lycoming ltc1k 4k bell t53 l 13b aerospace x plane experimental flight national aeronautics and space administration tilt rotor lycoming ltc1k 4k t53 airplane xv 15 bell helicopter bell xv 15 aircraft bell 301 rotary wing xv 15s xv 15 tilt rotor aircraft helicopter rotor position rotors helicopter airplane mode engine proprotors xv 15 tiltrotor research aircraft helicopter mode bell helicopter textron nasa ames research center rotor system vtol nasa research two aircraft vtol mode airplane propeller position propeller aircraft nasa experimental aircraft