Quote:
Originally Posted by Rango318
That is a great idea just to test the idea. I had thought about using it as part of the tail, but not to use it to see if it would help. Thank. I think I will try it today. 
Can i ask how you got those numbers? I love to do math and such and would really like to know how to calculate such a thing. I can only hope i get these numbers.  |
GM's Styling Dept. had a couple of guys who published an SAE paper back in the early 1960s.
They reported that a 10% drag reduction would mean a 5% mpg increase at a steady 55-mph.
The same 10% drag reduction would yield a 6% mpg improvement at 70-mph.
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After running the CRX at Bonneville in 1990,I called the GM Aero Lab and spoke with Glen Scharf (sp?),who I believe was the head aero guru at the time.Mr. Scharf told me that the 10%/5%,10%/6% relationship was still valid and could be used with high confidence.
We discussed the numbers I came up with for the salt and mpg figures and he felt that a reasonable guestimate for the modified CRX would be Cd 0.235.
Short of a trip to the A2 Wind Tunnel it's one of the few tools we have at or disposal for attaching numerical; values to our mods.