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Sikorsky XV-2
The Sikorsky XV-2, also known by the Sikorsky Aircraft model number S-57, was a planned experimental stoppable rotor aircraft, designated as a convertiplane, developed for a joint research program between the United States Air Force and the United States Army. The program was cancelled before construction of the prototype began.
==Design and development==
The XV-2 was developed as part of a joint U.S. Air Force and U.S. Army program intended to explore technologies to develop an aircraft that could take off and land like a helicopter but fly at faster airspeeds, similar to a conventional airplane. The XV-2's stoppable-rotor design was intended to allow it to hover and fly at low speed like a conventional helicopter. It utilized a single-rotor design; a counterweight provided stability to the rotor system,〔Boyne 1984, p.178.〕 while a tip-jet arrangement powered the rotor, which retracted into the upper fuselage when stopped, the XV-2 then flying like a conventional aircraft on delta wings.〔Sikorsky 2007, p.84.〕 A single jet engine was provided for forwards flight.〔Allen 1993, p.4-5.〕
The XV-2 prototype was assigned the serial number 54-4403, but the project was cancelled before construction could begin.〔Pearcy 1993, p.103.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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