Stalker UAS flight time improved by 2,400 percent using laser beams

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.

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