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Submission + - Boeing hydrogen powered drone first flight. (

garymortimer writes: "Phantom Eye’s innovative and environmentally responsible liquid-hydrogen propulsion system will allow the aircraft to stay on station for up to four days while providing persistent monitoring over large areas at a ceiling of up to 65,000 feet, creating only water as a byproduct. The demonstrator, with its 150-foot wingspan, is capable of carrying a 450-pound payload."
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Boeing hydrogen powered drone first flight.

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I have a theory that it's impossible to prove anything, but I can't prove it.