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I noticed then that the tube shaped paper airplanes were the ones that traveled the furthest, had the most stable flight, and followed the straightest path, out of all of the paper airplanes I tried.
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It sounds like the question assumes the benefit would be stability. The paper airplane is in free air. A vehicle is moving through turbulent air next to the ground surface. That changes things.
Some benefit may come from a short duct (less skin friction) to move air from a high pressure to low pressure area. There are cross-sections between round and square.
