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It works by moving against the air. The air's resistance creates most (or all) of the lifting force.
Lift is due mainly to the wing's angle of attack, forcing the air that the wing strikes downwards. The downward forcing of the air generates an equal-and-opposite upwards force that we call lift.
Be aware that the common and mistaken idea that lift is caused by "air moving faster over the curved top than the flat bottom" does not explain *most* of the lifting force.
If this were true, inverted flight would be impossible, as the "lift" would become "negative lift" and the airplane would plummet to the ground.
Some wings do give a small amount of lift at zero angle of attack, and this *is* due to the Bernoulli/venturi effect of differential camber.
If any lifting surface is an aerofoil, then some *do not* have differential camber (top and bottom curvatures).
There are *symmetrical* aerofoils (same top and bottom convex camber) flat ones (paper planes) and membranes (hang glider wings, parasails and kites).
To see this, go to http://en.wikipedia.org/wiki/Aerofoil, check out the "lift and drag curves for a typical aerofoil" graphic.
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ViviAn aerofoil or airfoil is the curved shape of an airplanes wing. Airplane's wings are different for each aircraft depending on its size and speed and function. The curvature of the top of the wing and the bottom are different and the shapes of the aerofoil were categorized and identified using NACA numbers. They were identified and registgered with their specific shape characteristics with the National Advisory Committee for Aeronautics (NACA), founded in 1915.
An airfoil is a blade that has an unequal cross section so that, as it passes through the air, the air it divides takes two paths of different length. The path of longer length has lower pressure on it than the path of shorter length. This causes lift, in the direction from higher pressure (shorter path) to lower pressure (longer path).
Wings, propellers, and turbine blades all have an airfoil cross section so that they can generate their own unique type of lift, or thrust, as the case may be. Angle of attack is part of this equation, but the airfoil is primary in making it all work effectively together.
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