A version of this article appears in the August 25 issue of Aviation Week & Space Technology. NASA Langley Research Center has begun tethered tests of the GL-10 Greased Lighting, a 10-ft. wingspan prototype of a hybrid-electric distributed propulsion vertical-takeoff-and-landing (VTOL) unmanned aircraft. With tilting wing and tail, the 55-lb. GL-10 is designed to combine VTOL capability with long endurance in a small unmanned aircraft system. Power is provided by two 8-hp 2-stroke ...

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