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Old 07-26-2012, 07:20 PM   #19 (permalink)
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Take an airfoil and perform a homothetic transformation by doubling the original size.

The result is a bigger, yet proportionally identical airfoil.

Both these airfoils have the same Cd. Yet their projected frontal area (A) are not the same.

Hence Cd*A ≠ Cd*2A.

I hope I am correct on this one..
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