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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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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