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Propeller pitch affecting power requirements

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More information and clarification is needed. What kind of propeller? Water? Air? These are very different. The term "throttle" (gasoline engine?) does not go with the term "amperage" (electric motor?) Do you mean brake horsepower (or kW mechanical) to rotate? Do you mean at the same rpm? Are you considering slip? Doubling the pitch is a rather extreme change. I have lots of fan and propeller data, figures, formulas, etc. all available free. For example, I have attached a set of curves for a 110 hp outboard motor. showing speed and rpm vs. pitch for a range of diameters.


This figure shows typical efficiency curves for a 28-foot diameter fan (about 100-200 hp) like you might find atop a cooling tower.


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