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Old 06-17-2012, 03:28 PM   #27 (permalink)
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Originally Posted by tjts1 View Post
But the ideal profile is much longer than your car. You can't just have it end abruptly and still expect any benefit just because you followed that profile half way to its conclusion. With that modification you create a much larger low pressure zone behind your car.
I can't believe I'm saying this, but I'd like to advocate something of a middle ground

The compact is about 20 , measured to the rear of the small trunk lid.
AndrzejM's Kamm is at 10 , increasing the wake area.

10 is less than what you can get away with, so it misses out some of the potential.
I'd go for something in between, around 15 or very near the optimal angle, and at the same time try to tie in the sides as well, making a trapezoid Kamm as seen from behind (ideally with rounded edges, and the rear filled in.)
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