[QUOTE=jimepting;199200][QUOTE=aerohead;199198] If your car car has an extremely well detailed,full bellypan,which under flow visualization demonstrates fully attached flow over its entire length then you'd want to include its area in a surface drag calculation.
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Has anyone here been able to demonstrate this level of modding of a "real" car? Has any manufacturer achieved this? If so, I missed it.
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I think it was the belly of Ferrari's F-40 which made the cover photo of AUTOWEEK back in the 1990s.There might be a shot of it in the Phil Knox's Aerodynamic photo albums in the archive.
It's as good as I've seen.
The old Citroen ID 19 also had a pretty sweet underside.