The higher-speed air on the top of the airfoil produces a lower pressure than the flow over the bottom, resulting in lift. Although airfoils come in many different shapes, all are designed to accomplish the same goal: forcing the air to move faster over the top of the wing than it does over the bottom. The shape revealed if a wing were to be sliced from its leading edge to its trailing edge is called the wing’s airfoil section. Significance: The shape of a wing’s airfoil section or sections determines the amount of lift, drag, and pitching movement the wing will produce over a range of angles of attack and also determines the wing’s stall behavior. Definition: A two-dimensional, front-to-back section or slice of a wing.
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