Quote:
Originally Posted by PANAVIA
He is using .42 Cd for his calculations which I think is optimistic. -- I think the open cobra is more like a .54-.60 Cd range.
I need to figure out how to figure that out.  |
It's pretty hairy math. You have to begin by measuring/calculating the square footage of the frontal area. This is the easy part. One technique is to take a photo, from the furthest possible distance to flatten perspective and the longest lens available to bring the image close, with measuring references in the pic. Print large, outline the car surface, and measure measure measure.
Calculating or even estimating the Cd from there would be... entertaining.
The short way to do it is see if anyone's ever thrown a Cobra into a wind tunnel, or find a similar car that's been tunnel-tested.
.42 doesn't sound too far off, IME. He says "published figure" but doesn't cite the source.