abandon it, after which it sank.

Sikorsky XV-2

The Sikorsky XV-2, also known by the Sikorsky Aircraft model number S-57, was a planned experimental stoppable rotor aircraft that was developed for a joint research program between the United States Air Force and the United States Army. The design utilized a single-rotor design: a counterweight provided stability to the rotor system, while a tip-jet

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