07-28-2003, 06:12 PM
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CC Member
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Join Date: Feb 2003
Location: Jacksonville Florida,
Posts: 82
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Not Ranked
Doug,
I think your Cd estimates are low. Cd is probably closer to .50 on an open Cobra. A Cd = .35 is a modern car like a Camaro. That may account for your low calculations on torque required at speed.
For comparison, I have a graph reprinted from an SAE technical paper that showed Cd = .8 for 1920's cars, Cd = .6 for 1940's sedans, and Cd = .38 for 1970's sedans.
Charlie
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