On Thu, 22 May 2008 20:13:44 +0200, Mxsmanic
wrote:

Stealth Pilot writes:

downwash occurs after the wing has passed.

Downwash is the result of the wing's passing. The wing accelerates air above
it downwards. That downward movement continues after the wing has passed, and
it is called downwash. It is the acceleration that produces the downwash that
is responsible for lift.

no.
what pushes the aeroplane up into the air is the pressure differences
at the surface of the wing.

the whole purpose of the rest of it is to create those pressure
differences *at the surface*.

a wingtip vortex is an example of pressure differences not at the
surface and those just cause drag.

keep at it son. one day it is sure to sink in.
Stealth Pilot