Here's a link to a photo out of Hucho's book.It's from Mair's research on boattails.You'll notice that the body undergoes a very gentle narrowing,with very little "angle" initially,growing steeper in inclination as it proceeds to the rear,and scaling from this coordinate grid,you'll be able to figure where the maximum 22-degree incline begins,and continues.Also,if you'll print this image,blow up the image scale,then add in additional grid lines,you can add finer resolution to the Cd values/Length.If you curve your cars body more abruptly than what bis shown,you'll more than likely experience separation.--------------------------------------------------------------
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