At the risk of adding fuel to this fire....

Consider a helicopter hovering in otherwise still air. We can all
agree there is a net downdraft, yes?

I don't see it as too difficult to consider the wing of a plane to be
a big linear fan blade doing essentially the same thing.

-Denny
<ducking for cover :-) >
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.