A liquid hydrogen-powered unmanned aerial vehicle that would be able to remain aloft five times longer than today's longest-flying UAV, the Global Hawk, is being eyed by the Defense Advanced Research Projects Agency. DARPA says liquid hydrogen's very high energy-to-weight ratio will make such an aircraft possible, and is the basis of an effort called Ultra Long Endurance Aircraft Program, or UltraLEAP. "Combining advanced airframe manufacturing techniques, fuel cell technology, ...
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