In article ,
Beryl wrote:

Alan Baker wrote:
In article ,
Alan Baker wrote:

In article ,
Beryl wrote:

Alan Baker wrote:

It's true that the exhaust stream doesn't directly push on the inner
surface of a rocket engine.
Yeah, I like that aerospike design, the inside-out nozzle thing.

wing encounters some unmoving air, and the wing then throws the air
downwards, the velocity of the air has been changed, and the wing
will experience an upwards reaction force. At the same time, a
downwash- flow is created.
The wing, remember, is moving forward. "Downwards" is one component of
circulation.
Those weren't my words.

Yes, but Newton's laws tell us that there is a net force down on the
air. No net force down on the air, no net force up on the plane.

Force is change of momentum with respect to time.

BTW, the man whom you are contradicting is Scott Eberhardt, Bachelors &

I wasn't, but I will now.

"...the wing then throws the air downwards" is just plain wrong.
"Downwards" is not a direction that the air was *ever* thrown.

You are incorrect.

The plane experiences a force upwards from the air, therefore (and this
is inescapable basic Newtonian physics) the air experiences a force
downward from the aircraft.

Bachelors and Masters from MIT, Ph.D. from Stanford, all in Aeronautics
and Astronautics, but you know better!

LOL

--
Alan Baker
Vancouver, British Columbia
http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg