Yeah ideally you want peak sustained load on the motor to occur within a certain motor RPM range. You adjust this load with prop size and pitch, and/or reduction ratio. Ideal motor loaded rpm depends on voltage. Find the rpm/volt constant for your motor. This is often 50 or 67 rpm/volt. For a 48v bank and a motor rated at 50rpm/volt, as an example, you want full power rpm at about 2400. So you match prop and reduction with motor rpm that will give you the desired percentage of hull speed at full poower. Your manual probably gives engine rpm. You can calculate prop rpm if you know your transmission reduction ratio and motor rpm via tachometer.
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