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I tried several times to do CFD. The problem is my SketchUp model is very "leaky" -- no surprise, really. And it is very rough, too. I am still hoping to remake the model with the very much smoother sections. I do hope to get at least a rough idea of the Cd.
Another option is to build a quarter scale model and take it to the MIT wind tunnel. Or, measure the actual car in coast down tests...
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