Device is called planimeter. But, because of th einaccuracies of the Cd
coefficient why go to so much trouble? Whay not just measure the overall
height and width, calculate the rectangular area them multiply it by
85%. That is enerally close enough for government work.
mayf, out in pahrump
Dave Dahlgren wrote:
>Make a full size cardboard template . Then either transfer it into a cad
>system or use a device called a perlimiter<sp?>.
>Dave
>
>
>
>>-----Original Message-----
>>From: owner-land-speed@autox.team.net
>>[mailto:owner-land-speed@autox.team.net]On Behalf Of Elon
>>Sent: Saturday, November 12, 2005 12:43 AM
>>To: land-speed submit
>>Subject: Area, as in CdA
>>
>>
>>I am trying to figure the frontal Area on my car to use in CdA
>>calcs. I was
>>going to put a 1ft length of duct tape on the front bumper and a 1ft piece
>>on the windshield. Then get as far back as I can and take a
>>digital photo.
>>I would print it out and then draw squares all over the picture using the
>>duct tape as my calibration for the squares. The problem is the
>>perspective
>>will shrink the 1ft piece on the windshield and the squares will
>>"pinch-in"
>>toward the top. I.e., they won't be perfect squares but narrower
>>at the top
>>due to perspective. Is this the correct way to do all this? Is there a
>>more accurate way? -Elon
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