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Old 01-03-2013, 12:01 AM   #17 (permalink)
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Have you looked at the Hucho book? Would lumps and bumps on the sides or top be good for drag? Would shielding lumps and bumps on the sides or top help anything? The ground and the spinning wheels makes the underside into a special case, and turbulence there is amplified by the proximity to the ground.

If there is adequate ground clearance and the underside is sloped up, then this allows the air to flow back under the car, and the pressure at the back bumper can be a closer match to the sides and the top. This greatly reduces turbulence in the back - which is the single greatest cause of drag.

An air dam that is lower than any part of the underside greatly increases drag. An air dam is a kludge solution for lift and/or a rough underside.

I'll take the Schlörwagen any day over a Camaro, by the way.
Sincerely, Neil
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