The suction on the top of a wing increases the effectiveness of the higher pressure on the bottom which pushes up or sucks up the wing. Since the force acts upwards the wing is pulled up by the suction and pushed up by the pressure. It may be difficult to envision the suction force and part of the difficulty is the depiction of the suction force. A viewer needs to be able to translate the lift-drag depiction to appreciate the lifting ability of the suction. Both components act together to cause the wing to lift. At low angles of attack the pressure under the wing is far less than the force from the suction above it. A moment’s reflection will verify the correctness of that statement. If it was false it would not be necessary to shape the top of a wing. A flat surface would work if the suction wasn’t important but it doesn’t.
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