Unmanned aerial vehicle (UAV) technology took a big step forward recently when Global Observer, an experimental UAV developed by AeroVironment Inc., made its first flight powered by a hydrogen propulsion system at Edwards AFB, Calif. The UAV had flown last year under battery power. Global Observer is designed for the ultimate in persistent surveillance: 24/7 operation 365 days a year. The hydrogen-powered flight lasted 4 hr., and the aircraft flew at 5,000 ft. above sea level. AeroVironment ...

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