| That is sometimes the trouble with things on paper, in paper it is possible to fly a car, in practice however, natural laws get in the way, such as gravity, energy law, which states that an engine produces heat at the same time as thrust, wind conditions, etc which may erode the ability of a design to fly in the real world. It is unknown whether any of Germany's flying Saucers ever got off the ground in the real world. They were designed on paper to but whether they did or not is another matter entirely. | 
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