Hi,
I'm pretty sure that Mike is right -- what he mentions about having a smooth underside is confirmed by the Hucho book in referencing the Schlör Pillbug. With that amazing car (Cd of just 0.13) there was an ideal height -- if it was lower or higher then the Cd was adversely affected. (I can't quote it, but I plan on buying the Hucho book soon -- I had it from the MIT library a while back.)
I'm hoping to do a belly pan, and I'm not willing to give up any ground clearance -- driving on New England roads require at least as much ground clearance that I currently have.
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