The best way to determine if your boat is operating at peak performance is to run it at wide open throttle to determine what maximum RPM your engine(s) are able to achieve. Run this test; it is the most accurate way for us to determine if your boat is operating at peak performance.
DISCLAIMER: Propeller sizing is theoretical in nature and is subject to sea trial. Our propeller size suggestions are done as a free service to the public. No warranty is expressed, implied or ever offered verbally to anyone. Propeller sizing is very subjective and may require alteration(s) to the propeller at an expense to the boat owner.