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Old 05-14-2013, 10:02 AM   #4 (permalink)
basjoos
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Location: Upstate SC
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Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

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Here's a link that might give you some info on optimum height. It's the section on ground effect in the Solar Car Primer and gives the formula for calculating optimum ground clearance for lowest drag. For a 6.5 foot wide teardrop shaped vehicle the optimum ground clearance is about 20 inches.

A solar car primer - Eric F. Thacher - Google Books
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