![The flight time of the Stalker UAS has been improved by 2,400 percent using a wireless las...](http://images.gizmag.com/hero/laser-power-stalker-uas.jpg)
Late last year, DARPA researchers upped the standard two-hour endurance of Lockheed Martin’s Stalker small unmanned aerial system (UAS) by a factor of four using a propane-fueled compact solid oxide fuel cell (SOFC). Now the flight time of the aircraft has been improved by a whopping 2,400 percent, with a test flight lasting more than 48 hours using a laser power system to wirelessly transfer power to the UAS from the ground... Continue Reading Stalker UAS flight time improved by 2,400 percent using laser beams
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