Contact: NRL Public Affairs Office
Naval Research Laboratory
Caption: Fueled by liquid hydrogen, the Ion Tiger unmanned aerial vehicle (UAV) completes a record flight time of 48 hours and 1 minute. The electric fuel cell propulsion system onboard the Ion Tiger has the low noise and signature of a battery-powered UAV, while taking advantage of high-energy hydrogen fuel and the high electric efficiency of fuel cells.
Credit: U.S Naval Research Laboratory
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