CyPhy Works' UAVs use ground-based power to stay aloft indefinitely

CyPhy Works' UAVs use ground-based power to stay aloft indefinitely:

Endurance is one of the biggest limiting factors of UAVs. To stay airborne longer, Boeing has turned to hydrogen to fuel its Phantom Eye, Qinetiq’s Zephyr relies on solar power and Northrop Grumman’s Global Hawk can refuel autonomously in mid-air. But CyPhy Works has taken a different approach with its first UAVs. By connecting to a ground-based power source via a “microfilament,” the UAVs are able to stay aloft indefinitely. ..
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