А вы сами-то сходили? Или ограничились пересказом ламерской статьёй журналиста, не умеющего пересказать даже то, что написано прямо на первой странице сайта:
Robert D. Hunt, the Chairman of Hunt Aviation, has filed for international patent protection for an innovative new phase change hybrid airship design powered by the thermal energy in the air. The energy to power gliding flight is obtained from the atmosphere itself. An efficient power cycle is created using the natural temperature difference from a low altitude to a higher altitude. Heat energy is taken from ambient temperature air at a lower altitude to power the GravityPlane and heat is rejected to colder air at high altitude to complete the power cycle.
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Robert D. Hunt, the Chairman of Hunt Aviation, has filed for international patent protection for an innovative new phase change hybrid airship design powered by the thermal energy in the air. The energy to power gliding flight is obtained from the atmosphere itself. An efficient power cycle is created using the natural temperature difference from a low altitude to a higher altitude. Heat energy is taken from ambient temperature air at a lower altitude to power the GravityPlane and heat is rejected to colder air at high altitude to complete the power cycle.
Где тут хоть намёк на энергию гравитации?