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Old 01-01-2020, 11:09 PM   #6 (permalink)
freebeard
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If it's a wedge that's widest at the front, consider more of a bullet shape with a leading edge fillet to promote re-attachment with some taper leading to a boxed cavity.

I'm not sure about surface roughness. I believe dirt and duct tape don't have much effect, it would involve Reynolds number. 'Attached turbulent flow' is a term aerohead has used.
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