Cd=0.32, but What is the Cd*A? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 8 (permalink) Old 09-16-2010, 11:45 AM Thread Starter
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Cd=0.32, but What is the Cd*A?

I have found a few articles that say the coefficient of drag of the Cobalt is 0.32. Does anybody know what the Cd*A, coefficient-of-drag times area, is? thanks

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post #2 of 8 (permalink) Old 09-16-2010, 04:40 PM
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Er... why exactly do you need it?


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post #3 of 8 (permalink) Old 09-16-2010, 04:50 PM
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TechnicHally, Since air is a fluid and since the wind only sees the front projection of the car when it hits, you can take the area of the front projection of the car and times it by the coefficien of drag. This is by fluid dynamic theorem.
To clarify, the front projection o the car is the measurement of the face of the car as you see it staring right at it. Kinda hard to describe in words right now lol. I'm also in class...

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post #4 of 8 (permalink) Old 09-16-2010, 05:51 PM
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Probably because he wants to reduce his drag coefficient to get better fuel economy...

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post #5 of 8 (permalink) Old 09-17-2010, 01:32 PM Thread Starter
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Quote:
Originally Posted by slipstream View Post
Probably because he wants to reduce his drag coefficient to get better fuel economy...
Nailed!
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post #6 of 8 (permalink) Old 09-17-2010, 02:01 PM
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how do you plan on doing that?



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post #7 of 8 (permalink) Old 09-17-2010, 03:45 PM
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good luck man. They don't design and test the bodies of these cars in wind tunnels for nothing. But hope my answer helped you a bit. It's a tricky topic.

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post #8 of 8 (permalink) Old 09-18-2010, 06:54 AM Thread Starter
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Quote:
Originally Posted by camopaint0707 View Post
how do you plan on doing that?
With a partial or total grille block

Per BboyTaktix's comments: thanks for writing. I have a hunch that the automakers measure the CdA and then "work backwards" and divide the CdA by the frontal area to obtain the Cd.

I was killing time at the Chevy dealer and one of the salesmen produced for me a big book of Chevy truck data that had the frontal area measurements for all of the vehicles. Truck buyers can use the frontal area and payload weight to calculate which truck and which engine to buy for the types of loads that they are expecting to carry or tow. So, GM has data like this somewhere.

For that matter, GM gives drag data on new products to automobile writers.
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