AeroVironment has successfully flown it’s Global Observer unmanned aircraft for the first time powered by a hydrogen-fueled propulsion system. With a wingspan of 175 feet, the Global Observer is a long-endurance UAV that could stay aloft up to a week at a time according to the company.
The first hydrogen fueled flight lasted four hours and [...]
Source: http://www.wired.com/autopia/2011/01/hydrogen-powered-unmanned-aircraft-makes-first-flight/
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