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If you really want a discussion, is lift the result of low pressure on top of wing holding it up or higher pressure on bottom of wing holding it up? Symetrical wing airplanes fly, paper airplanes fly, the airfoil just makes for more efficient lift. Here's the question; airplane at an airshow doing aerobatics made hard pull, tail fluttered and horizontal stab and elevator departed airplane. Tail continued down causing extreme acceleration(g). Wing folded up like a butterfly. Were the wings forced back by the sudden blast of relative wind, or sucked back by the low pressure on top of wing?
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