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thats not the main reason.
eventually if you keep increasing the pitch of the wing, it will cause separation on the underside, which will rapidly/hugely increase the drag and simultaneously slash the negative lift...
That is why some racers with multi element wings can actually run at a pitch of over 90 degrees (ie air flow actually travelling forward when leaving the 'trailing edge'.
message me your email address and I will send you an aero assignment i did last year that has all teh diagrams and a better explanation if youwant...
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