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These theories are all very well IN A VACUUM but once you introduce air you introduce DRAG. The whole reason you streamline your vehicles. In a vacuum a brick has the same drag as an Indy car.
Drag (physics) For a solid object moving through a fluid or gas, drag is the sum of all the aerodynamic or hydrodynamic forces in the direction of the external fluid flow. It therefore acts to oppose the motion of the object, and in a powered vehicle it is overcome by thrust.
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