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Old 07-08-2008, 08:25 AM   #5 (permalink)
Shawn D.
Harebrained Idea Skeptic
 
Join Date: Jun 2008
Location: Alpharetta, GA
Posts: 211

The White Car - '84 Mercedes-Benz 300td
90 day: 28.84 mpg (US)

The Blue Car - '86 BMW 535i
Last 3: 23.86 mpg (US)
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There's nothing mysterious about this. The seam (not "seem") can both trip the thin boundary layer itself as well as trap droplets that further trip the boundary layer. Putting vortex generators at the top of the windshield probably won't do anything except impart sideways flow, given how thin the boundary layer is.

Quote:
Originally Posted by .Cd View Post
Since you have a really good .Cd...
Sorry, .Cd, but there's no "." in "Cd."
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