Help with prop size
I have a 23 ft pontoon with a 115 Mercury Command Thrust motor. The boats max speed is 20mph with a WOT around 4300 rpm. The current prop is a 16” / 13 pitch. I feel like I’m leaving some RPMs on the table as the WOT should be in the 5-6k range. I would like to get the max speed up for tubing.
What size prop should I be looking at and what is a realistic increase in MPH?