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Old 12-10-2009, 10:37 PM   #285 (permalink)
NeilBlanchard
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Greetings Tom and welcome to EM,

Thanks for posting that -- is this the chart you are referring to?



If the length of the boattail is less than 1/10 of the length of the car, then the maximum/ideal angle is ~14 degrees. If the length of the tail is 1/4 the length of the car, then the angle is ~17-18 degrees. And if the boattail is 1/3 the length of the car, then the maximum/ideal is ~19-20 degrees; and it yields a drop of 0.07+ in the Cd -- if I'm reading it correctly.

So, on my proposal model, the maximum angle can be ~17-18 degrees, since the tail is about 1/4 of the overall length after it has been added.

This chart looks like it might have come from Hucho -- can someone confirm?
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