UAVs, Systems, Electric Propulsion, Energy Storage... This flight test program seems to incorporate all the current hot-buttons of 21st-Century aircraft. Recent activity from Boeing and Aerovironment has showcased hydrogen-fueled power generation using engine technologies. Insitu has gone back to the fuel cell. Tougher technology, but fewer moving parts... the reliability wagers are hitting the table, so place your bets.
http://www.marketwatch.com/story/hydrogen-powered-fuel-cell-flies-scaneagle-2012-04-05
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