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Hi Matt,
Mercedes may have accounted for the scale difference/Reynolds Number by increasing the velocity; we don't know? I tend to think that they know enough to have the right number. The final Bionic is a real car with a Cd of 0.19, and the progression up from the fish, fish model, car model, to the built car, all fit.
The Goldenrod has a Cd of 0.11-0.12. You could be right about the Dolphin, but the AeroCivic is ~0.17.
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