Quote:
Originally Posted by mf70
That was fun to watch & think about.
1) the rectangle didn't have the same cross section as the foil and the original rod, so the drag value really can't be compared.
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No, but it certainly is telling - it had a much reduced frontal area, and yet displayed much greater drag.
An equally telling display, I think, would be to build this same rig and test three shapes: a square, add a rounded nose to the square for a bullet shape, then add a proper tail to the bullet to create an airfoil. That would keep the frontal area constant.