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Old 01-05-2010, 03:37 PM   #399 (permalink)
aerohead
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Quote:
Originally Posted by Frank Lee View Post
I think it's safe to say some of these angles we take for granted can be cheated somewhat (made steeper) if other elements are in place. As evidence I offer the way the upper rear of the EV1 sits under the aero template. With the good Cd it has, I'd think the flow back there is good.
Frank,I agree. 22-degrees seems to be the magic limit if the C-pillars can feed some air towards the backlight.Chrysler was able to pull this off with the Daytona 500.
I tried to make the template a little liberal.Both development models for Kamm and Jaray have L/D ratios LESS than 2.5:1 and as you can see in the K-car windtunnel photo,the flow separates over the last foot of the roof as it falls way too steeply.
I do believe the EV-1 has separated flow.Check out Gallery-12 in the FLOW-IMAGES and see what you think.
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