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Old 04-19-2012, 12:02 AM   #344 (permalink)
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Originally Posted by cfg83 View Post
aerohead -

Would these two elevations be equally aerodynamic? :

I'd say that the first one is lower drag, and here's why: the shape of the front accelerates the air out and around the high point on the roof, and this creates a localized high pressure, which then help the air "spring" back and it helps maintain attached flow. So, it adds to the atmospheric pressure and this improves the air flow a bit.

If the rear of the shape is most important, then the front is next most important -- it matters less, but it matters. At the very least the second one has more surface drag.
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