proper pitch

[salisbury128]

I have a 17' fiberglass that I am repowering from a 115 Hp to a 65 Hp (115 Hp went up). I accquired a 1972 Evinrude 65 Hp but it does not have a propeller and I am wondering what the best diameter/pitch combination would be for maximum efficiency.

 

[LubeDude]

Re: proper pitch

What do you want to bet that the 65 uses twice the fuel the 115 did????

 

[Dhadley]

Re: proper pitch

Start with the prop you have. It will, most likely, be too much pitch - depending on how your V4 was set up - but its a start. Once you get your baseline rpm you can calculate the proper pitch from there.<br /><br />Good luck!

 

[rickdb1boat]

Re: proper pitch

I would say a good place to start would be a 10 X 11" pitch for that size boat with the 65 HP. That's for a 16'-17' BOATS - ALL LOADS. Then get a Tach and check your top end RPM's and go from there.

 

[salisbury128]

Re: proper pitch

I knew my gas consumption would skyrocket, but it was more of a budget decision (dropping HP) to just be able to get the boat back in the water.