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Originally Posted by Bicycle Bob
I'm still waiting for the reference on that "ideal" 2.5: 1 teardrop. My many other sources all say that trying to proceed from 5:1 to 3:1 will almost inevitably cause separation. And what if there is any modification to the forebody shape, for wheels or other practical considerations?
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Bob,the reference is from Hoerner,it's from airship hull research.For a frontal area-based drag coefficient,the fusiform body of revolution,with 1/3 forebody,and 2/3 aftbody and thickness ratio(length/diameter) of 2.5:1 has Cd 0.04 in free air.An image of this form appears in Hucho's book and is sourced from Horner's book of 1951,Table-7.2,I believe.I'll try to get this stuff online this coming Saturday.