The propeller is an important and vital component of any boat. Every motor has a correct rpm operating range and choosing the right propeller for your boat determines that the best fit will be a propeller that prevents the engine from over-revving but allows it to reach the minimum rpm rating where the maximum horsepower is produced.
The correct propeller size is determined in part by the wide open throttle (WOT) operating range which can be located in the owner’s manual and is expressed in horsepower at a particular rpm.
CUPPED OR UNCUPPED?
The two main variants of propeller are the uncupped and cupped version. The uncupped propeller does not have any cupping at the trailing edge of the blade.
The cupped lip of the cupped propeller offers improved bite in the water and typically results in higher top-end speeds.