Quote:
Originally Posted by aerohead
GM reported Cd 0.137 for it's modified EV1 which set a closed-course, United States Auto Club ( USAC ), land speed record of 183.8-mph in 1993, at the Bridgestone / Firestone Proving Grounds, Fort Stockton, Texas.
This car had been previously reported with Cd 0.14, in Goro Tamai's, book, 'The Leading Edge,' with the data attributed to Bart Hibbs of AeroVironment, if memory serves me.
Cd 0.137 ties Ford's 1985 PROBE-V concept car.
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Interesting, but I wouldn't get too excited by Cd figures to three decimal places. A top aerodynamicist suggested to me that taking three decimal place Cd figures as gospel was basically a fool's errand. (As in, test in different wind tunnels and you'd likely get a larger variation than this.)