The prototype fully rigid Aeroscraft airship produced by Aeros Corp has hovercraft landing gear and operates with a buoyancy system similar to that used by submarines and this week it received its experimental airworthiness certification from the FAA and began flight testing at Tustin, Calif..
Aeros' prototype is 266 feet long and 97 feet wide. It is powered by three engines that provide both thrust and control (by swiveling), augmented at speed by aerodynamic control surfaces.
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Gravity always wins!