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Old 04-04-2008
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Prop question for the new boat

The warden and I purchased a Pearson 33-2 this fall. It has a Yanmar 2GM engine with a 1" shaft and a fixed 2 blade 16X10 RH prop.
I stumbled across a deal on a used Maratec folding prop but the pitch is 12 instead of 10 would this work with that size Yanmar?. I'm assuming it has a reduction gear.
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Old 04-04-2008
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It really depends on the boat, engine HP, transmission gearing, and such. IIRC, going up to a 12 pitch, from a 10 pitch, will generally drop your top end RPM by about 500 RPM. It may also cavitate more, as it is a steeper pitch and may slip more. You really need to talk to a prop shop about this IMHO.
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Don't quote me, but some of the folding/feathering props are pitch adjustable. I know my max prop is, but not positive about others. Definetly a call to a shop is in order! And worth it if it will work. The previous and original owner of my boat, gained about 1-1.5 knots switching from a 2 blade fixed to the Max Prop.

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I agree: check with a prop shop or the manufacturer. My plastic boat really benefitted under sail with a folder, but there are a few drawbacks as with anything. Google is your friend here.
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Quote:
Originally Posted by Valiente View Post
I agree: check with a prop shop or the manufacturer. My plastic boat really benefited under sail with a folder, but there are a few drawbacks as with anything. Google is your friend here.
Roger that....This is the first inboard I've owned so I'm at the bottom of the learning curve here. SD here are the general specs for the engine.

Continuous rating output Hp/rpm = 16/3400

1-hour rating output. = 18/3600

Reduction ratio forward = 2.21, 2.62, 3.22

Reduction ratio astern.= 3.06

Propeller speed (at cont. rating)
Ahead.= 1540, 1298, 1055

Reverse.= 1113

I will send an e-mail to the manufacturer as well but any info/experience would be appreciated.
John

Last edited by Sabre66; 04-04-2008 at 06:08 PM.
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Old 04-04-2008
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John, also make sure your boat has a 1 inch shaft. My 1988 P-33-2 has a 1 1/8 inch shaft. And yes, best source of info is Martec. I also suggest posting this on the Pearson email list because there are a ton of P-33-2 owners on there.
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You probably have the 2.21 reduction, as that is what is behind my 2gm with same general specs as you have. Off the top of my head, I do not remember what size and pitch I have for my boat.

You can find the ratio on the side of the trans IIRC, altho the back upper part is ringing a bell for my setup. Yours may vary a bit.

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Old 04-05-2008
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Quote:
Originally Posted by blt2ski View Post
Don't quote me, but some of the folding/feathering props are pitch adjustable. I know my max prop is, but not positive about others.
The Martec folders are not adjustable.
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Old 04-05-2008
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Sabre66, it would help to first know what the current performance of your engine with this 2blade 16Dx10P prop. What is the max rpm you achieve with this prop. Is it smoking black at max rpm?
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I have a 1982 2GM (No F, as it is raw water cooled) Peak 15hp, continuous 13hp.

I assume you have something like a 2GM20 or 2GM20F. Just so you get the right specs!
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