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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.
The first experimental aircraft specification, for a transonic rocket plane, was placed in 1945, and the first operational flight of an X-plane took place when the Bell X-1 made its first powered flight nearly three years later at Muroc Air Force Base, California, now known as Edwards Air Force Base. [3]
As used here, an experimental or research and development aircraft, sometimes also called an X-plane, is one which is designed or substantially adapted to investigate novel flight technologies. [ 1 ] [ 2 ] [ 3 ]
Category for prototype helicopters Pages in category "Experimental helicopters" ... American Helicopter XH-26 Jet Jeep; B. Boeing–Sikorsky RAH-66 Comanche; C.
Piasecki Helicopter: 1952 1954 707 American Helicopter XH-26 Jet Jeep: Experimental tip jet. observation helicopter. American Helicopter: 1952 Never 5 Sikorsky CH-37 Mojave: Assault Transport Sikorsky Aircraft Corporation Large heavy lift helicopter used by the Army designated "Mojave" and Marines nicknamed "Deuce" 1953 1956 153 Cessna CH-1 Skyhook
The Lockheed XH-51 (Model 186) is an American single-engine experimental helicopter designed by Lockheed Aircraft, utilizing a rigid rotor and retractable skid landing gear. The XH-51 was selected as the test vehicle for a joint research program conducted by the United States Army and United States Navy to explore rigid rotor technology.
The Bell XV-15 is an American tiltrotor VTOL aircraft. It was the second successful experimental tiltrotor aircraft and the first to demonstrate the concept's high speed performance relative to conventional helicopters.
The Bell D-292 was an American experimental helicopter developed by Bell Helicopters for the United States Army Advanced Composite Airframe Program (ACAP), as part of the studies involved in the Light Helicopter Experimental (LHX) program.