FARNBOROUGH — Lockheed Martin has flown a small unmanned aircraft for 48 hr. using laser power beaming as the company works to grow its presence in the UAV market. The test took place in a wind tunnel and involved Lockheed’s hand-launched, battery-powered Stalker UAV and LaserMotive’s power beaming system. Stalker has an endurance of 2 hr. on battery power alone. In 2011, Lockheed flew an “extreme endurance” version able to stay aloft for more than 8 hr. on combined propane fuel-cell ...

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