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Old 06-11-2018, 09:20 PM   #722 (permalink)
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Quote:
Originally Posted by aerohead View Post
In Hucho's book he shared a metric researched by Buchheim et al.,in which they reported that we could take the rear down-slope to a maximum 23-degrees without inviting flow separation.
Buchheim's lowest drag body was the VW 'Flow',at Cd o.14 as a long tail.
If you look at his graphic for this car,I came up with 22.5-degrees maximum angle by just laying a protractor to the drawing.
So then I assume if we design the curve to 23 degrees to depart the body at the 80% mark that would be within the parameters and this would also mean that the overall principle would likely be less than the std 1.78 tail ratio.
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