Sikorsky XV-2
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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 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.

Il Sikorsky XV-2 anche noto con il nome di costruzione S-57 era un progetto impostato dall'azienda statunitense Sikorsky Aircraft Corporation per un aeromobile sperimentale con rotore arrestabile in volo e retrattile.1

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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 to explore technologies 2

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