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Old 20-10-2012, 10:45   #16
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Re: Sabre 362 motors too slowly... Prop issue?

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There is almost never a reason to haul a boat for any prop work and a competent diver can repitch any Max Prop with no problem. PYI has a list of qualified divers around the country that can do this while the boat is in the water. Give them a call and ask.
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Old 20-10-2012, 11:02   #17
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Re: Sabre 362 motors too slowly... Prop issue?

We have the same engine with a 16" 10 pitch fixed prop pushing a loaded 35' boat and @2600 rpm she does a steady 6.9 kts and will be close to 8 at max. The boat moves with authority and so should yours. Either a prop and/or gearing issue if the bottom is slick... my bet.
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Old 20-10-2012, 13:30   #18
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Re: Sabre 362 motors too slowly... Prop issue?

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Originally Posted by fstbttms View Post
There is almost never a reason to haul a boat for any prop work and a competent diver can repitch any Max Prop with no problem. PYI has a list of qualified divers around the country that can do this while the boat is in the water. Give them a call and ask.
I know you've said that before but it sure isn't gonna happen with my prop.

Too many pieces to gt loose. I wouldn't even know how to get the nut undone while at neutral B...
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Old 20-10-2012, 13:32   #19
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Re: Sabre 362 motors too slowly... Prop issue?

That's not a max prop is it?
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Old 20-10-2012, 16:58   #20
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Re: Sabre 362 motors too slowly... Prop issue?

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That's not a max prop is it?
Yes. It's a 2-blade classic.
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Old 20-10-2012, 17:02   #21
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Re: Sabre 362 motors too slowly... Prop issue?

hmmm.... never seen one of those, all mine had a zinc on the end, but they were all 3 blade....
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Old 20-10-2012, 22:33   #22
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Re: Sabre 362 motors too slowly... Prop issue?

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hmmm.... never seen one of those, all mine had a zinc on the end, but they were all 3 blade....


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Old 21-10-2012, 00:12   #23
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Quote:
Originally Posted by Ex-Calif

I know you've said that before but it sure isn't gonna happen with my prop.

Too many pieces to gt loose. I wouldn't even know how to get the nut undone while at neutral B...
But it does happen with that prop. No need to remove the nut if you are just changing pitch.
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Old 21-10-2012, 01:52   #24
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Also check the calibration of your tach. Mine was way off
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Old 21-10-2012, 02:48   #25
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Quote:
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But it does happen with that prop. No need to remove the nut if you are just changing pitch.
Good point - only 9 bits that can fall to the bottom instead of 12.

Plus it is also packed with grease. Hard to keep track of the alignment marks.

Not saying it cant be done. I just wouldnt want to.
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Old 21-10-2012, 10:40   #26
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Re: Sabre 362 motors too slowly... Prop issue?

A diver repitched mine in the PNW murky water. I thought for sure he had dropped something, because he came out of the water after such a short time.... all was good and done. It would sure be a problem if you couldnt find a piece he dropped though!
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Old 21-10-2012, 10:49   #27
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Re: Sabre 362 motors too slowly... Prop issue?

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A diver repitched mine in the PNW murky water. I thought for sure he had dropped something, because he came out of the water after such a short time.... all was good and done. It would sure be a problem if you couldnt find a piece he dropped though!
I use a "safety net." No lost parts to date.



BTW- PYI have always assured me that if I were to ever lose a part, they would next-day-air a replacement to me at no cost.
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Old 22-10-2012, 06:55   #28
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Re: Sabre 362 motors too slowly... Prop issue?

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Trying to gauge how slowly I move under power versus other boats, and what I might be able to do about it.

I've got a 1993 Sabre 362 with a Yanmar 3HJ, 38 hp @3800 rpm. The prop is a 16" 3 blade MAX feathering prop. I've had the boat for just over a year. Sails beautifully, but can't help but notice I just don't move well under power. From what I've read, 2800-2900 rpm represents a good cruising level of throttle. At that level, I do about 4 knots in calm water. Maybe I can pick up a 1/4 to 1/2 knot if I nudge it just above 3000 rpm.

But I feel like I should be able to hit 5 or 6 knots at cruising speed. Other sailboats always seem to pass me by.

Anyone experience something similar? Thoughts on how to address the problem? Is the lack of power just something I need to learn to accept with a feathering prop?

Thanks for your suggestions
You're right. That is too slow. Must be the pitch. But I also think those cruising RPMs are too high, at least for efficiency's sake. Once you have the pitch right I would try something closer to 2000 rpm. You won't lose a lot of speed and you'll save a lot of fuel.
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Old 22-10-2012, 09:57   #29
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Re: Sabre 362 motors too slowly... Prop issue?

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You're right. That is too slow. Must be the pitch. But I also think those cruising RPMs are too high, at least for efficiency's sake. Once you have the pitch right I would try something closer to 2000 rpm. You won't lose a lot of speed and you'll save a lot of fuel.
Yeah, find your sweet spot... probably in the 2400-2800 range... where the engine/drive train runs nice and smooth, and you're near hull speed.

Is the lack of power just something I need to learn to accept with a feathering prop?
Not at all, you Max prop should be better than most anything else you can get.
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Old 22-10-2012, 10:02   #30
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Re: Sabre 362 motors too slowly... Prop issue?

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Is the lack of power just something I need to learn to accept with a feathering prop?
No. You are clearly underpitched. Contact PYI for Max Prop pitch setting recommendations for your boat.

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