DragonTheta Posted April 16 Report Share Posted April 16 Hi, I hope this is the right part of the forum. I'm wondering if the pitch of a propeller is doubled, what percent increase will that be for the amperage required to run it at the same throttle percentage? Thank you Quote Link to comment Share on other sites More sharing options...
dudleybenton Posted April 18 Report Share Posted April 18 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. Quote Link to comment Share on other sites More sharing options...
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