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thousands?
Depending on your target Cd there could be thousands of forms you could use.
If you're going for extremely low drag with consideration for little else than drag reduction.then the field will narrow.
The 'Aerodynamic Streamlining Template' is based on the 'pumpkin seed' first used by Paul Jaray in 1922 to achieve Cd 0.13.
Walter Lay used it in 1933 to get Cd.12
MG EX 181 used it in 1953 to get Cd 0.12
GM Sunraycer used it in 1987 for Cd 0.089- 0.12
HONDA used it on Dream-2 for Cd 0.10
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