The Platt-LePage XR-1A was an early experimental transverse rotor helicopter developed for the United States Army Air Forces in the early 1940s.
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Previously:
Bell Boeing V-22 Osprey unfolding - GIF and photos
Herrick HV-2A Vertaplane - photo
Bell HSL-1 helicopter - photo
Flying jeep Curtiss-Wright VTOL quadrotor helicopter - photo
Hughes HX-17 heavy-lift helicopter - photos
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