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Originally Posted by 3-Wheeler
I would agree that the water spray from the tire "appears" to be going backwards.
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Now the question is:
1) Is the majority of the spray really going "backwards" off the tire from centrifugal force?
2) Is the spray really going forward on top of the tire in the wheel well, hitting objects inside the inner fender, dropping toward the road surface, and the wind catching it and "pushing" it backwards? (this is my choice).
I can ask the engineers at Michelin. I'm sure they know. But the tire is basically smooth on the footprint surface. If I spin my Dremel tool at 10,000 rpm with even a rough sanding wheel on it, I can't feel any air spinning off of it. And if I recall the math correctly again, truck tires spin at like 500-600 rpm. If truck tires were built like water wheels on Mississippi steamboats, I could see a lot of water spinning off it due to centrifugal force. But again, tires are smooth. I think the tires are picking up the water from the road only, and then slinging it out.
Quote:
Originally Posted by 3-Wheeler
If it was my truck, and I'm looking for aero gains, I would certainly make a specialized duct from the radiator back to the exhaust opening, and keep it separate from the tire well area if possible.
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Agreed.