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Brommers
My point really was that if the front half of your shape has fucked the airflow, you can't get much back with the back half, and a semicircular front half has already fucked your flow. If you imagine modifying this aerofoil into two competing shapes, one with the original nose followed by a semicircular tail and one with a semicircular nose followed by the original long tail, you should find that the one with the original nose has the lower drag.