What you appear to be proposing is a roof spoiler.
I would suggest a roof wing which provides a leading edge air slot that directs air downward parallel to the rear windshield.
This air will be (because of the restriction) accelerated and of lower pressure than the air above.
The air above will be drawn down to fill the void below it.
I've done this to my pick-up truck cabin, and seen something similar on a Scion recently.
It is unconventional, but that's what this forum is all about, right?
Aerodynamics Photos by kach22i | Photobucket
http://ecomodder.com/forum/showthrea...1-a-19525.html
Quote:
Originally Posted by kach22i
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