New (inexperienced) boater here with a new 26' Sanpan pontoon (model 2500 Limited, 2 tubes). Boat has a Yamaha F115 4-stroke, and WOT is around 5800rpm. Prop that came stock with motor is aluminum, 13" diameter, 15" pitch.
Max speed I get is only around 16.5mph with 3 people on board running...
