Quote:
Originally Posted by Shepherd777
750 mm. I don't know what 750 mm is in inches. I'm American.
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about 30 inches.
Be VERY careful about the rpm you try to spin it at. Axial flow fans (traditionally a boat's propeller, but a traditional car fan sort of acts like one) the amount of air is a function of the RPM, the diameter, and the pitch of the blades.
Your's looks to be a radial flow, which functions in part as the SQUARE of the RPM. So, as you spin it faster, your horsepower requirements can go up a LOT.
Like Instarx says, the radial fans will build more suction/pressure then axial flow.
An aside. What would be REALLY cool would be to drive the fan with a hydrostatic pump - the logic would be to measure exit temp coolant out of the radiator, and drive the fan faster until the coolant temp drops.
Optionally, the a traditional fan clutch would work also, and is much simpler, and proven and cheap and an example of doing it the easy way.