NASA research shows Hybrid-Electric Propulsion can Achieve 4 times Increase in Cruise Efficiency for a VTOL Aircraft
Engineers at NASA’s Langley Research Center in Hampton, Va., are studying the concept of vertical takeoff and landing electric engine drones with models such as the unmanned aerial system GL-10 Greased Lightning. The GL-10, which has a 10-foot wingspan, recently flew successfully while tethered. Free-flight tests are planned in the fall of 2014. This research …