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the birds wings act as an airfoil,as air goes over the wing it creates lift,as the wings move upward the tip moves backwards and the air moving over the wings pulls the birds wings up and also the air moving below pushes the bird up and as the wing goes downward the wing feathers twist slightly witch causes thrust. the air foil shape of there wings helps them produce lift and the larger the wing the greater the lift. there are three major drag forces that a bird produces, they are: frictional drag,form drag and lift induced drag.

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12y ago

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