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I don't see anyone ducting air from a central schnorkel, too much internal skin friction. It should be a converging duct with a tall narrow exit. The target is the back edge of the wheelwell. The objective is to prevent air rolling outward from the opening.
I don't know whether the exit must be parallel to the side/outside the tire face, or angled out at 45°/on the outer tread.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Necessity is the mother of invention, but simplicity is it's favorite aunt --Amish proverb
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