RE: Car Aerodynamics

[erict@cta.com (Eric Thorstenson)]

Alex said:
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Cd is dependent on speed once above about 30 MPH. Cars are optimised for
different speeds. Normally the drag coefficient shoots up for any car
after above 70 MPH.
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Cd as a function of speed? Hmmmm.....

Sorta flies in the face of the SAE standard practice of determining
a (constant) Cd using acceleration and coast-down tests, which by
their nature involve a wide range of speeds.

Drag *force* as a function of speed, yep. Drag *coefficient* as a
function of speed, well, that would be news to me...

Eric T.     '86 5kS
erict@ra.cta.com