Quote:
Originally Posted by MetroMPG
I think this one's better:
I measure a 9% angle (from horiz.) from the highest point of the roof to the end of the spoiler in that pic, vs. 10% for the silver car and 13% for the red car (after correcting to make the wheels level)
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For a first guess, I start with the maximum angle at any area on the back of 15 deg. On the bottom, where air can't flow in from below, I start around 5 degrees, depending on several factors.