Paul;

I got this far and stopped; because right here is a factor that
leads to
a lot of confusion in dealing with aerodynamics.  The "tiny
marbles" in
your anology are NOT moving.  They are standing still and have
no
momentum. The plane is moving past, and pushing them around, but
they
begin at rest.

Al

That is true Al but what counts is the relative motion.

That's what Einstein said.

--
Perry

>From the point of view of the NACA duct... they look like 200 MPH
marbles :)

Paul Lamar
 
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