Quote:
Originally Posted by Daox
Is there a generally agreed upon relief angle (rear window angle off the roof) which should not be passed as far as aero is concerned?
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I've read the initial transition shouldn't exceed approx. 10 degrees. You can exceed the angle, after the initial 10 degrees, if it's done gradually.
As for overall rear angles, I can't find the reference at the moment. But there is definite agreement that up to a certain overall (average?) angle is OK, then there's a zone past that where drag increases significantly, and beyond that, it's reduced again. I'll have to dig it up.
Books: you could look for
Hucho or
R H Barnard.