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Old 20th Jan 2006, 19:41
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barit1
 
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The two are inseparable.

Newton's Third relates [action] = [- reaction]. Bernoulli's effect changes the direction of flow around the airfoil, so that it is deflected (in the case of a wing) downward. This action is reacted by the upward force (lift). One cannot have one without the other.

For a propeller, rotate the above image 90°.
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