[aerohead]

Originally Posted by sendler

75% reduction wouldn't be correct. Maybe 75% remaining of the full length is what was meant.
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I have heard that the penalty of a Kamm can be a 10% increase in cd with the truncation at 60% of the original length or the point where the width at the truncation is 1/2 the maximum width of the airfoil. This is the trade off I am building my tail with in order to keep the loss of garage space to a minimum and to have a flat area at the rear for the tail light and license plate. This will save me 30-40 inches of overall length.

please see permalink#235