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
Since you have a really good .Cd...
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Sorry, .Cd, but there's no "." in "Cd."
