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Old Nov 16, 2012, 10:02 AM
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somerset, nj
Joined Feb 2005
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Originally Posted by ShoeDLG View Post
Many posts in this thread have invoked Newton's Laws to support the idea that by pushing on the air, a lifting wing must change the net (linear) momentum of the air. The implication is that a wing creates lift in fundamentally the same way that a rocket creates thrust (by imparting momentum to its propellant). If that were true, you'd be able to count up the vertical mometum in the airplane's wake and show that it's rate of change is equal to the lift. That isn't the case.
ok, linear momentum is not changing. The air isn't being pulled from above and forced into the ground.

is the angular momentum of the air changing? (maybe i'm wrong in calling this angular momentum, i don't want to get caught up in semantics, hopefully you understand what i mean by this)

If so, what causes it to change?
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