He's not saying air has a fixed structure. Rather, he is saying
there is some depth to the flow of the air around the shape
of the foil. It is not just a couple of molecules thick and
as one increases the distance from the foil the air molecules
are still existing at increased distances from each other
and the pressure is lowered because of this lower
density.


"Oz1" wrote in message ...
On Tue, 08 Jul 2003 22:44:16 GMT, "Wally" wrote:


If the same lump of air that was split at the leading edge is reconstituted
at the trailing edge, then those molecules that passed around the outer
surface 100mm away *must* have travelled faster than those that passed the
inner surface 100mm distant.

And that's where your theory falls down!
You assume that the air is some kind of lego block toy that has a
fixed structure and that after passing over the foil it must once
again lock back into that same structure.
If that were so how would you explain turbulence and vortices


Oz1...of the 3 twins.
I welcome you to crackerbox palace,We've been expecting you.