Propeller pitch determines the final gear ratio between the engine and the water. A boat should be “propped” to operate wi

thin its wide-open throttle (WOT), which can be found in the motor specifications or the owner's manual.

A propeller is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral, that, when rotated, exerts linear thrust upon a working fluid, such as water or air.