The Global Observer UAV has earned the unique honor of being the first hydrogen-powered unmanned aircraft to complete a successful maiden test flight.
The Global Observer UAV flew at 5,000 feet over Edwards Air Force Base in California, but further tests are planned that will test the craft at heights of up to 65,000 feet. The most appealing advantage of sustainable unmanned vehicles is that they can stay aloft for extensive periods. The Global Observer UAV, for example, is expected to be able to fly uninterrupted for as long as a week before it needs to land.
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