Outboard shaft size

[Kris]

Go longer

Go for a extra long shaft which is 25 inches. I like the Yamaha high thrust 8 or 9.9 horsepower. 8 would be big enough. My dad has a 9.9 on his 10,000 pound Irwin 30. It pushes it no problem, big prop has a lot of power. Also does better in reverse. The main thing is to keep prop in the water, get the longest shaft possible for a bad weather day.

 

[Kris]

Go longer

Go for a extra long shaft which is 25 inches. I like the Yamaha high thrust 8 or 9.9 horsepower. 8 would be big enough. My dad has a 9.9 on his 10,000 pound Irwin 30. It pushes it no problem, big prop has a lot of power. Also does better in reverse. The main thing is to keep prop in the water, get the longest shaft possible for a bad weather day.

 

[Ross]

Try to get the biggest low pitch prop you can

One inch of pitch equals one knot at 1000 rpm with no drag. Since you can't get much of a gear reduction on an outboard then going for a low pitch reduces slip and more and larger blades increases thrust. I turn a 13x15 three blade with a 3:1 reduction gear on 10 horsepower inboard 5.5 is my top speed with that engine power but at 4.5 knots I don't get stopped by head winds and waves.

 

[Ross]

Try to get the biggest low pitch prop you can

One inch of pitch equals one knot at 1000 rpm with no drag. Since you can't get much of a gear reduction on an outboard then going for a low pitch reduces slip and more and larger blades increases thrust. I turn a 13x15 three blade with a 3:1 reduction gear on 10 horsepower inboard 5.5 is my top speed with that engine power but at 4.5 knots I don't get stopped by head winds and waves.

 

[JCrumpley]

Yes to the Yamaha high thrust

I have a 8 hp high thrust, electric start, electric tilt Yamaha with controls on my 2006 Hunter 25. The yamaha is a great motor. I have the 25" shaft. It is quiet, starts easily, recharges the battery, and uses very little fuel.

 

[JCrumpley]

Yes to the Yamaha high thrust

I have a 8 hp high thrust, electric start, electric tilt Yamaha with controls on my 2006 Hunter 25. The yamaha is a great motor. I have the 25" shaft. It is quiet, starts easily, recharges the battery, and uses very little fuel.

 

[KennyH]

25 inch long shaft

For the size boat you have you need the 25 inch long shaft. I did see that evinrude/johnson had a 30 inch at some point but don't know much about availablity. I have mine mounted very low and it still will cavitate in the Albemarle Sound on my Hunter 25 in rough weather. It is very long shaft at least 25.

 

[KennyH]

25 inch long shaft

For the size boat you have you need the 25 inch long shaft. I did see that evinrude/johnson had a 30 inch at some point but don't know much about availablity. I have mine mounted very low and it still will cavitate in the Albemarle Sound on my Hunter 25 in rough weather. It is very long shaft at least 25.

 

[bffatcat]

outboard shaft length

Ive got a pearson26w with an 8hp long shaft 20" works fine. a 20" shaft should be fine under almost all conditions. I would get a new motor and avoid griefwith a used one

 

[bffatcat]

outboard shaft length

Ive got a pearson26w with an 8hp long shaft 20" works fine. a 20" shaft should be fine under almost all conditions. I would get a new motor and avoid griefwith a used one

 

[bffatcat]

outboard shaft length

Ive got a pearson26w with an 8hp long shaft 20" works fine. a 20" shaft should be fine under almost all conditions. I would get a new motor and avoid griefwith a used one

 

[bffatcat]

outboard shaft length

Ive got a pearson26w with an 8hp long shaft 20" works fine. a 20" shaft should be fine under almost all conditions. I would get a new motor and avoid griefwith a used one