Finding Pontoon prop ?

[25 Ft Suntracker]

I have 25 ft Suntracker Fish Barge with a 75 Hp sea pro . It has a 14x13 prop on it now And is running at 23.4 mph and 5600 rpm at WOT . Motor plate has 5250 max rpm . What would be my best prop for this boat . Can anyone help me find the best prop. thanks

 

[Art Bernard]

Re: Finding Pontoon prop ?

I'd add a pitch and go to a 15. Google "prop wizzard" and try that out to.

Art

 

[Bob_VT]

Re: Finding Pontoon prop ?

Welcome to iboats.

Is that with a load of people or you alone??? Yes adding 1" of pitch will (should) equal 200 rpm reduction.

 

[steelespike]

Re: Finding Pontoon prop ?

What is a Sea Pro? Is it by Mercury or Force?Has it allways run at 5600?What year is it?
You really would have to go to a 15" pitch to get to 5200.Seems like a lot of prop for a 75hp 25 ft pontoon.Your speed seems good so your prop appears to be working well.
I suspect your tach may not be accurate.

 

[25 Ft Suntracker]

Re: Finding Pontoon prop ?

two people and 22 gallons gas Motor is 75 hp tracker year 1999

 

[25 Ft Suntracker]

Re: Finding Pontoon prop ?

Motor year 1999 Brand Tracker motor Mercury I just got boat and ran it from info i read rpm was to high so i was thinking had wrong prop the man i got pontoon from said he did not ever run wide open so he does not know what rpm was at WOT.

 

[steelespike]

Re: Finding Pontoon prop ?

I think you should verify the tach is accurate.Is the prop in excellent shape?
If your tach is off and you prop for 5200 you could end up 300to 400 rpm too low.
that makes the motor lug which leads to poor economy, poor performance and strains the motor possibly leading to premature repair problems. It is very likely the 13 was from the factory thus correct.If you have a regular marina you may be able to borrow a shop tach or get a tech to go out with you for a quick run to check the tach.
If it checks out by all means go to a 15.