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quote: Here are three aeroforms, a cylinder, a superellipse and a square. Would their Cd be equivalent?

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The frontal areas are different the shapes are different,making it unlikely that they have precisely the same cd.
Why do you feel the model with its corners and sharp edges is as aerodynamic as the curved models? i feel the added mass will increase frontal area and the hard edges will create turbulence from mixing in the opposing airflow from the sides/top.