H41 prop, please tel me with prop do you have

[Valerio]

I have a 45 hp yanmar with 3 fixed blade prop 18 x12
Today i have installed a used Max Prop and i put a 13 pich, not happy about the result, i can overev the engine to 4000 rpm
Hitting 7.5 knots.
Tel me your set and results

 

[Dave Groshong]

I show 17 x 11 for a 3 blade, $849

 

[Rjm st.petersburg]

I love my MaxProp, especially in reverse. Try changing your pitch. I normally run 2000 rpm at 6 knots comfortably.

 

[sail sfbay]

Suggest taking the used Max Prop to a propeller shop to modify it to match your engine power range but be aware that will not be cheap. In the meantime, check with Max Prop Max-Prop Propellers – New England Propeller Inc. (neprop.com) on the what the correct diameter and pitch ahould be for your engine.

 

[Rjm st.petersburg]

You should have 1.5"-2" gap between the prop and hull. Adjusting the pitch is easy and can be done either in or out of the water.

 

[Valerio]

I love my MaxProp, especially in reverse. Try changing your pitch. I normally run 2000 rpm at 6 knots comfortably.

What letter are your max prop settings ?

 

[Valerio]

You should have 1.5"-2" gap between the prop and hull. Adjusting the pitch is easy and can be done either in or out of the water.

I think you do not know how complicated the assembley of the prop it is, it is impossible to do under the water !

 

[Rjm st.petersburg]

I do know, and had my diver change it when he did my bottom. Only took a couple minutes, he didn't even charge for it.
Call MaxProp and see what they recommend.

 

[Rjm st.petersburg]

I forgot to mention, "X"= N and "Y"= D

 

[Rjm st.petersburg]

The previous settings should give you 22 degrees. I have a 2.36:1 gear reduction with an 1.25" shaft

 

[Valerio]

I forgot to mention, "X"= N and "Y"= D

do you have de 40 hp engine ? these are my settings too but i can hit 4000 rpm and i feel i am under the pich i need, can you overreved your engine too ?

 

[DayDreamer41]

do you have de 40 hp engine ? these are my settings too but i can hit 4000 rpm and i feel i am under the pich i need, can you overreved your engine too ?

Not to be a wise butt, but you should actually check your RPM with a strobe or hand held, just sayin.....
Would not changing the pitch from 12 to 13 reduce engine RPM? So either prop is not pitched to 13 or your tach is off, what did your 18/12 prop for max RPM?

 

[fstbttms]

I think you do not know how complicated the assembley of the prop it is, it is impossible to do under the water !

I wish I would have known that before I did it 50 or 100 times

 

[fstbttms]

I do know, and had my diver change it when he did my bottom. Only took a couple minutes, he didn't even charge for it.
Call MaxProp and see what they recommend.

If you have a Max Prop Classic, I guarantee it didn't take "a couple minutes."

 

[Rjm st.petersburg]

I missed typed, I have a 54hp Yanmar. I can't hit 4000rpm even going downhill with the wind.
Fstbttms, maybe you need to change divers

 

[fstbttms]

I missed typed, I have a 54hp Yanmar. I can't hit 4000rpm even going downhill with the wind.
Fstbttms, maybe you need to change divers

Considering that I am a PYI-recommended Max Prop installer, I doubt that.

Which model Max Prop do you have?

 

[Rjm st.petersburg]

Fstbttms I have the classic.
I can't begin to tell you how impressed I am with your recommendations. We can bounce barbs back and forth, but it really is counter productive to this forum. If you wish to continue entertaining each other, please do it by private message.

 

[Rjm st.petersburg]

You are free to disagree with my statement, as I am free to disagree with yours.

I wasn't going to have the adjustment in the water. However my diver assured me it wasn't a problem for him. Then I asked Fred Hutchinson at PYI and he prefers the adjustment out of the water, but he knows a lot of people do it in the water. While the water is considerably warmer in Central Florida than S.F. bay, he doesn't have to wear a drysuit and gloves to do it as I would imagine you would.

 

[DayDreamer41]

 

[Valerio]

My prop is the old one, in order to change the pich you must disasemble everything and each screw has a security pin, the new one are very easy to change pich. I think dayDreamer41 is correct i need to see what the revs are really.!