Piasecki X-49 "SpeedHawk" - vectored thrust ducted propeller (VTDP) experimental helicopter
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The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined development 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. | Military Leak
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