Quote:
Originally Posted by instarx
I'm not sure about that. Typical 18 inch fans turn at about 1,000 rpm on low speed and move about 2500 cfm. Car wheels turn at about 800 rpm at 60 mph. Wheels are probably not going to be as efficient at moving air as a dedicated fan, but I don't think it is out of the realm of possibility for a turbine design wheel to move 500 -1,000 cfm at 60 mph.
Of course we don't know if these even are turbine design wheels, but the effect of wheel design on airflow doesn't seem to be one that can be dismissed out of hand.
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I can see how you might expect some airflow there except that I did some numbers and found that at 60 mph they will be fighting 5280 fpm and the negative (to your percieved flow) pressure differential between the underside of the car and the outside. Add to that a sub optimal relation to the air they are trying to move and the way they rotate and I think you can see why I was so doubtful.
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