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ertw, the air separates where the body turns down. What is the angle in relation to the floor there?
Also, are you modelling a fixed floor, or a moving floor like the real world is?
Also, can you model with ZERO ground clearance?
The "optimal" shape has always confused me - it violates the 20 degree slope, and I don't understand how the air is supposed to stay attached.
I bet if you change the slope of the roof to be the same all the way back, CD will improve.
I'd be curious if you just chopped the car at the slope change if the CD will improve.
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