Quote:
Originally Posted by bondo
In the wind tunnel testing of my Aerolid, I was told by the Engineers, at the American pickup truck manufacturer whose wind tunnel I was in, that the air flowing around the top and sides of the cab never gets sucked into the gap between the cab and a camper shell/aerocap. This is due to there being higher pressure air being forced out the gap from underneath the truck, so the air actually travels backward from what one would intuitively think.
The smoke tests showed this to be true also.
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In the pic, the smoke seems to be detaching from the aerolid rather than following it
Regardless of what direction the actual flow goes, it'll create more drag being there than when it wasn't there.