lift, wings, and Bernuolli
Downwash occurs, as you describe in the paragraph
above. It is a consequence of lift, not the cause.
We perhaps disagree merely on the idea of which "causes" the other. How
do you figure that lift causes downwash? Lift doesn't happen unless the
air above is rarified. The air above is not rarified until some of the
molecules are gotten rid of somehow. The process of getting rid of
those molecules is just a newtonian process (which lends itself to
certain bulk equations).
They are different ways of looking at the same thing, depending on which
aspect you want to concentrate on.
Jose
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