I have 2 props for our 20' pontoon. 1) 14-11 3 blade and 2) 13.25-13 4 blade prop.
RPM (from dash tach, so take it for what that's worth) w/ the 3 blade is about 5300.
from the 4 blade about 4700
Engine range is 4500-5500 so both seem to be within range. Optimum is 5000.
Now I called our local...