Fuel Cell Powered Unmanned Aerial System Achieves Flight Endurance Milestone

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Researchers have completed a successful flight test of the fuel cell powered XFC (eXperimental Fuel Cell) unmanned aerial system. During the June 2 flight test, the XFC UAS was airborne for more than six hours.

More... (http://www.sciencedaily.com/releases/2009/08/090806141720.htm)