Gravity Plane

Hunt Aviation promotional video on a passenger/cargo plane that uses physics and alternative energy for flight. It is also referred to as a "fuel less" aircraft.
See solar airplane on youtube at:
http://www.youtube.com/watch?v=5oNHD4

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It uses bouancy from helium and aerodynamic lift to rise. And it uses aerodynamics and bouancy to move forward, through and up and downward motion through the sky, like a submarine, whales and dolphins. Thus it requires very little energy. And what energy it does need it derives from wind turbine air compressors, solar photovoltaic electricity collectors. And it stores energy in high pressure air storage tanks and batteries.

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