Even when the plane producers have achieved secure techniques, regulators at all times ask for a backup system. Both techniques need to act independently, and even should be developed independently from totally different groups. Even if is misplaced, plane must be in position to continue operations, subsequently primary techniques have to be doubled by redundant backup systems which should be utterly dissimilar.
Moller began developing VTOL craft in the late Nineteen Sixties, however no Moller automobile has ever achieved free flight out of floor effect. The Moller Skycar M400 was a project for a private VTOL (vertical take-off and landing) plane which is powered by four pairs of in-tandem Wankel rotary engines. The proposed Autovolantor mannequin had an all-electric version powered by Altairnano batteries.