Long endurance is the Holy Grail for designers of vertical-takeoff-and-landing (VTOL) unmanned aircraft, and Dzyne Technologies is preparing to enter a new phase of flight testing with a subscale prototype of its contender, the RotorWing. The design is a tailsitter in which the wing functions as the rotor in vertical flight, propelled by engines mounted midspan, then converts to a conventional fixed-wing aircraft for forward flight. Dzyne has conducted hover flights with a 9-ft. span ...


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