Quote:
Originally Posted by Cd
And the cD figures from the DragQueens article - can you explain that ? ( The accuracy )
Yet another way to verify the cD of the Camaro would be to look at the cars' top speed, correct ?
Since this car was built for that exact thing, I would think you could do the math and find the true cD, or at least something close.
I would have to look back at the articles to see what horsepower the car ran at.
It ran at several tracks - not just Bonneville, so this would also be a good indicator, correct ? ( lakebed salt / lakebed dirt / landspeed track asphault )
The guy that owns the car is on Facebook etc. If that would be helpful.
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Let's go to the fundamental idea.
Are you suggesting that a tiny wind tunnel (without a moving floor or wheels) like you have shown can develop accurate data?
That goes against common sense (why would manufacturers bother building huge wind tunnels), goes against the steady increase in wind tunnel size and complexity as car manufactures have chased better accuracy, and goes against all the published technical literature on automotive wind tunnel design. I don't know of even one peer reviewed SAE paper that covers a full size car in a tiny wind tunnel.
I don't want to be rude, but if you want to gain good knowledge on a subject, at some stage you have to look at some decent sources for yourself. My library is covered for painting but, from memory,
Low Speed Wind Tunnel Testing (Pope?) would be a good start.
As for the figures from the tiny tunnel - who knows? Maybe they juggled compensation factors, maybe they made them up, maybe they're all serendipitously correct?