75 HP Force Prop size

[tfordala]

I have a 1999 Force 75 HP on a 20 ft pontoon boat...my prop says on it...13x19...at WOT it barely reaches 4300 RPM but seems sluggish alot...What size prop do I need to put on it to get the motor to perform better?

 

[SkiDad]

Re: 75 HP Force Prop size

I would go at least 15 pitch... My boat had a 17 pitch and I was getting 4500-4600 rpm.... going to 15 got me 5000-5100 rpm... normally you gain 200 rpm for every pitch drop - so from 19 to 15 you should gain around 800 rpm and get you around 5000 rpm.... your engine is rated to go 5250 rpm

 

[jestor68]

Re: 75 HP Force Prop size

The Spitfire Pontoon(4 blade) is referred to by Mercury as the best pontoon prop in their line up.

The prop selector calls for a 15 pitch for your boat.