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Old 10-27-2010, 01:44 PM   #1 (permalink)
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Vehicle Coefficient of Drag List

On the wiki I was going to see if I could add more info on my car but the formula "Frontal Area formula = Height * Width * .84" seems to be a bit off for the spread sheet.

The only I can get any on the cars entered to work was to use Frontal Area formula = ((Height * Width * .84)/12)/12

That just does not seem right to me I understanding dividing by 12 once to go from inches to feet but I do not see why it has to be done twice.

I just added the Frontal Area for my Grand Prix as ((54.7*72.7*.84)/12)/12=23.197ft^2

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Old 10-27-2010, 03:14 PM   #2 (permalink)
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A square foot is 12*12 = 144 square inches. You need to divide by vertical inches and horizontal inches.
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Old 10-27-2010, 03:21 PM   #3 (permalink)
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Quote:
Originally Posted by Phantom View Post
That just does not seem right to me I understanding dividing by 12 once to go from inches to feet but I do not see why it has to be done twice.
You have to divide by 12 to go from inches to feet for both width AND height when calculating area.
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Old 10-27-2010, 03:50 PM   #4 (permalink)
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Ok thanks I just updated the wiki to clarify.

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