A vertical-takeoff-and-landing (VTOL) unmanned aircraft with rotors that stop and fold to become wingtip extensions, improving cruise efficiency, is entering ground testing at startup Joby Aviation. The Lotus is a 55-lb. UAV that pioneers the “multifunctional reconfigurable propeller” concept developed by Santa Cruz, California-based Joby from a NASA design study for cruise-efficient VTOL. NASA’s Dos Samara concept had single-blade rotors mounted on the wingtips that ...


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