主题：【原创】美国的空中铁拳向何处去？ -- 晨枫

Boeing X-50

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The Boeing X-50A Dragonfly, formerly known as the Canard Rotor/Wing Demonstrator, is a gyrodyne unmanned aerial vehicle that was being developed by Boeing and DARPA to demonstrate the principle that a helicopter's rotor can be stopped in flight and act as a fixed wing. The X-50A builds upon the work of the Sikorsky X-Wing program of the 1980s by designing the vehicle as a multi-mode aircraft from the ground up. The X-50A is one of two projects funded by DARPA in its "Heliplane" program.[1]