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Ok thanks aerohead, very interesting indeed. I have often wondered about the shape of the 'cut'... and its influence on the eddies behind it.
i drew a little sketch, then read your post again... "no angles in the shape..." sort of answers my questions. So a continuous lip would be similar? - like the mercedes low drag concept?
then treat the rear surface with a porous material?
Man i want some windtunnel time! Thanks for the input.
oh one more thing, when you say ring vorticies, does that describe the eddies in the smoke tail? Or something else?
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