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The GL-10 Greased Lightning is a ten-engine, battery-powered prototype with a ten-foot wingspan that can change its shape midair to fly either horizontally or vertically. This month, NASA announced it recently took off vertically and, for the first time, successfully rotated its wings to transition from “helicopter” mode to standard “wingborne” flight.
NASA's GL-10 design is expected to be 4 times more aerodynamically efficient than an multicopter drone