You might like to look at Goran Malmberg's website. He has played with Pantera Aerodynamics.
http://hem.passagen.se/hemipanter/
Jim Hall and Hap Sharp are my heros for ground effects innovations. Only problem is every time they developed something the sanctioning bodies made rules against their developments. Try:
http://www.sandcastlevi.com/racing/chaprral.htm
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