One hundred feet above the U.S. Army’s Aberdeen Proving Grounds in Maryland, executing pre-programmed hover maneuvers, the experimental Excalibur could be providing a glimpse of future unmanned combat aircraft. And not just because of its unusual configuration. Flown for the first time on June 24, the aircraft is a testbed for a hybrid turbine-electric propulsion system that developer Aurora Flight Sciences believes can efficiently combine high speed and vertical takeoff and landing ...

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