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I wonder if there is already a term for this - a corollary to frontal area - the rear area that is beyond attached flow?
The ideal is obviously 0 - but minimizing this - whether it is taper on the top, sides, or bottom, is key to low drag.
Also balance is important - if the top is too tapered and the bottom is not tapered enough - this causes asymmetrical turbulence which overwhelms the trapped pocket of still air, that a Kamm back depends on to work.
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