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The way I heard it, the NACA duct was intended for low-flow situations, such as cockpit ventilation. I'm sure that AI would look at the overall situation and only recommend a NACA duct if no high-pressure area was nearby.
Regarding how to design a fast car, I still like John Cobb's approach, choosing a shape with the minimum surface drag rather than minimum frontal area, and fitting the machinery into that.
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There is no excuse for a land vehicle to weigh more than its average payload.
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