Bill, the truth is many engines do not need a fan whatsoever. Once you are moving above 10-15 mph, the frontal area pushing the wind does the cooling without a fan.
While in retrospect, this was not one of my more stellar moments, I did drive the car pictured below on the mandatory tour at the MARC Nat'l Meet in Dearborn a few years ago with a hopped-up banger engine and
NO cooling fan. We were all in one big parade driving through the streets of the city from traffic light to traffic light, and it never heated up until I was just about through entrance line where they were giving out the ribbons as we entered the field at the airport. It steamed but never boiled, so it kinda proves that oftentimes you really don't need a cooling fan. One thing I do believe is too many fan blades are more detrimental as they rob horsepower and set up a wall impeding airflow through the radiator at higher speeds.
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