Re: 15 minute classroom version...

[William Beaty <billb@ESKIMO.COM>]

On Tue, 24 Aug 1999, David_Anderson wrote:

> There is some bouncing off the bottom of the wing.  In fact, simulations
> show that almost 1/2 of the lift on a barn door in flight (and your hand
> out the car window) is due to the air interacting with the bottom.  Of
> course, it is a little hard to directly detect the force caused by the
> lowering of the pressure on the back of the hand.  It would feel like a
> force on the palm.

I certainly agree.  The problem is this: does the column of air below the
wing behave as a trampoline resting on the earth?  Clearly it does not.
I've set forth my reasoning in other messages, so everyone can see what I
see if they choose to.  When the wing interacts with the air immediately
below it, this does *not* cause a significant force to arise between
itself and the earth.  It does not even cause an indirect, delayed force.


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