Pink Gray Parrot Had A Dream Of This Bird But Never Saw One. The fundamentals of bird flight are similar to those of aircraft in which the aerodynamic forces sustaining flight are lift and drag Lift force is produced by the action of air flow on the wing which is an airfoil The airfoil is shaped such that the air provides a net upward force on the wing while the movement of air is directed downward Additional net lift may come from airflow around the bird s body in some species especially during intermittent flight while the wings are folded or semi folded cf lifting body.
A bird s wing acts as an airfoil a curved surface evolved to provide lift and reduce drag turbulance and friction Air pushed into the airfoil by the bird s forward motion pushes more forcefully on the curved underside of the somewhat upward tilted wing This forces air downward and causes and equal and opposite reaction causing the bird to rise At the same time air is moving more quickly over the upperside of the airfoil wing than the stream below the wing As the air moves faster over the top of the wing pressure is diminished relative to that of the underside and the bird gains lift rises This follows Bernoulli s principle
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