Boeing’s hydrogen-powered Drone

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Once operational, the Phantom Eye, boasting a wingspan of 150 feet (46 m), will reach altitudes of up to 65,000 feet and carry payloads weighing up to 450 pounds (204 kg). Its liquid-hydrogen propulsion system, whose only byproduct is water, is designed to allow the aircraft to stay aloft for up to four days.

 

 

Another interesting fact  is shown by the graph below, it again shows the great potential of hydrogen!

Energy_density

Source: http://www.gizmag.com/boeing-phantom-eye-taxi-testing/26157/

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