Gallery: Naval Research Laboratory Flies Their Hydrogen-Powered Ion Tig...

Ion Tiger 902 on landing approach.

A team from the U.S. Naval Research Laboratory (NRL) have broken their own record after flying their hydrogen fuel cell powered-Ion Tiger UAV for an astonishing 48 hours and 1 minute last month. The UAV, which used liquid hydrogen fuel in its  new, NRL-developed, cryogenic fuel storage tank and delivery system, broke its previous record of 26 hours and 2 minutes which it set in 2009.

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