Information includes a description and operation of the propeller, installation and removal instructions, testing and troubleshooting information, inspection and check, and maintenance practices information.These dimensions are used to describe the propeller, usually in inches, and always stated as diameter x pitch.For example, a propeller described as 14.5 x 19 has a diameter of 14.5 inches and a pitch of 19 inches.These dimensions are often stamped or cast right on the propeller.
Recreational boat propellers are usually offered in two-inch pitch increments within a prop model line, but some high-performance props are offered in one-inch increments to allow for fine-tuning boat performance. The blades on a propeller are analogous to the threads on a screw. Some propellers have a constant pitch, meaning the pitch is the same at all points from the leading edge to the trailing edge of the prop blades. ![]() Progressive pitch improves performance in high-speed applications. A boat should be propped to operate within its wide-open throttle (WOT), which can be found in the motor specifications or the owners manual. Procedure For Propeller Pitch Measurement Full Load OfIdeally a motor with a WOT range of 5000-5800 RPM (as noted on the boat tachomter) will reach 5400 rpm with the boat running wide open and trimmed out for optimal performance, with a full load of fuel and water and an average passenger load. That RPM may go up with a light load of fuel or passengers, and lower with a heavier loadby propping for the middle of the range there is leeway in either direction. Moving up or down two inches in pitch will usually change WOT engine speed by approximately 400 RPM. A prop with too much pitch may deliver more top speed because the prop moves further forward with each rotation, but acceleration may be poor and the boat will struggle to get on plane.
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