Quote:
Originally Posted by UltArc
I am not trying to disagree, but I can NOT believe everyone who has done a belly pan is just imagining the results. I will trust that the theory on improving the belly pan is accurate, or plausible, but to say that a belly pan does nothing? I can't believe that one bit. Too many people have done too good of testing for me to believe that a belly pan is worthless unless it has dimples or whatever.
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I hate to keep harping on Hucho, but in section 4.4.7 of the 4th edition, he restates some information developed by Buchheim who worked on the Audi 100. According to Buchheim's measurements of underbelly sections, the front section(to just behind the front wheels) was worth Delta Cd of -.015, the middle of the car was worth Delta Cd of -.015, and the diffuser section (starting front of rear wheels was worth delta Cd of -.015. The total is Delta Cd of -.045, which is pretty large in aero terms. Hucho has just a short summary of the results. He references the original paper which would be nice to see, but it is in German.
My own Insight underbelly can be seen here:
http://ecomodder.com/forum/showthrea...s-22691-2.html
post #17.
There are a number of aero improvements on the car, but I recently did 112MPG over a 90 mile segment with rolling hills, so something is working on the car
