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It is interesting to study what newer OEM rear treatments are doing. In general I would say the Germans are taking this more seriously than the Japanese. The American designers are somewhere in between. Some designers are incorporating something like a kammback effect on the lower edge of the bumper face in an attempt to carry the bottom air past the rear flat. Others are doing just the opposite and including molded ridges that run parallel to the air flow to help it move smoothly up the back side. This would be similar to the vortex generators that are getting press these days. The kammback design is nearly universal on the upper trailing edge these days. Once you start looking at these details it gets to be sort of an obsessive habit.
Has anybody here played with the vortex generators?
Sam
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