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Old 07-27-2012
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changing to folding props

Can anyone weigh in on folding props. I am considering changing my props to folding ones. Any ideas? Does anyone know a prop supplier who can actually provide support so I don't end up over revving my engines?

Thanks
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Old 07-27-2012
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Re: changing to folding props

Engines, as in more than 1? What kind of sailing are you doing? A lot of racing or more cruising, daysailing? I wouldn't bother unless you're doing at least some racing.
A folder will help your speed, especially in light air. The sacrifice is less reverse, less drive in big waves (especially compared to a 3 blade).
I went from a fixed 2 blade to a Martec several years ago. Speed better under sail, don't really mind the downside mentioned above. In heavy weather I prefer to sail rather than motor anyway.
Marten can recommend size and pitch so your engine will run at right rpm.
A feathering prop is best all around solution but probably twice the money.
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Old 07-28-2012
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Re: changing to folding props

Thanks. No racing lots of cruising. I prefer not to use the iron Genoa. I am looking at folding props but before I jumped off and spent the bank I really wanted some input.

Thank you.
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Old 07-28-2012
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Re: changing to folding props

We have a Max Prop from PYI. It is a feathering, not folding prop, but serves the same purpose. Reduce drag when sailing. Even cruising, that extra half knot or so can make a big difference over time.

Personally, I prefer feathering and I've had great experience with Max Prop. It's built like a tank and, as pointed out, will perform better in reverse around the dock. Last year, I must have hit something submerged and nicked the leading edge of one blade. I shipped it to the factory and it came back looking brand new.

The newest models, which I do not have, are even better. You can adjust pitch from outside, without opening the gears. They will help you with the correct initial setting, but sometimes a degree or two flatter or steeper can be better for the motoring you do.
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Re: changing to folding props

I noticed a mis-spelling in my post above. The brand is Martec, not Marten. Again, if not racing, I'd spend the money somewhere else (new sail?)
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Re: changing to folding props

First and the test data supports it reverse is fine and in my case MUCH BETTER over the fixed 2 blade 12 X 8

It works better because you can have a blade design that does NOT have to comprise blade shape VS drag which is a factor in fixed sailboat props







I do a race and the old 12 X 8 fixed was so small anyway i am hard pressed to say anything was really better with the exception of REVERSE which is now vastly better
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Re: changing to folding props

Quote:
Originally Posted by rackham the red View Post
Can anyone weigh in on folding props. I am considering changing my props to folding ones. Any ideas? Does anyone know a prop supplier who can actually provide support so I don't end up over revving my engines?

Thanks
Folding props? Engines? Multiple? You have more than one prop and engine? What kind of boat are we talking about?

If you're racing a folding prop is pretty much a necessity. They'll give you time for a fixed prop, but it won't be enough in light air. This I know from experience.

If you're day sailing I wouldn't bother, unless you've money to burn and/or you really want to get the most out of the boat just because you can.

If you're a cruiser I'd think twice. Yes, it will help performance--otherwise racers wouldn't use them. But they introduce complications and another point of failure. Many cruisers spend a lot of time motoring, and some of that time is because conditions are too adverse for sailing. Not a good time for prop misbehaviour. Many cruisers also spend a lot of time maneuvering in unfamiliar anchorages and marinas. Again: Not good times for prop shenanigans. Many cruisers go with feathering props, rather than folding, or stick with fixed props.

The prop companies will recommend a prop (or props) for your boat, depending upon boat, engine(s), etc. I just had both Gori and Flexofold spec props out for Abracadabra.

For a folding prop I'd go with Gori, I think. For a feathering prop: The Max-Prop is pretty much regarded as the best, but a lot of cruising sailors swear by the Kiwi.

We race and day-sail. Some day we hope to cruise. We had a Martec on the boat, but were not pleased with it, so the fixed prop is currently fitted. Next spring I hope to put a Gori on. We were considering a feathering prop, but our normal sailing grounds are very weedy, and one of the advantages of a folding prop is less snagging of things in the water.

Jim
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Re: changing to folding props

Ditto MaxProp from PYI, first class gear and service and without compare.
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Re: changing to folding props

I am a big fan of the Martec folding props having had quite a few of them and found them simple, reliable and not dependent on wildly expensive proprietary zincs.

Gori is the worst prop I have ever experienced. I would never own another Gori. While beautifully machined and cleverly designed, they have an absurdly high failure rate, require wildly expensive proprietary zincs when used with a sail drive, and have miserable, bordering on non-existent product support.

My understanding is that Flex-o-fold has similar issues, but that came to me second hand and was only based on one owner and his description of other owner's with similar problems.

I like feathering props in a lot of ways, but they require more maintenance and often rely on proprietary zincs as well.

I assume the OP's plural on 'props' means that this is a catamarran and so may also have out drives, potentially making prop choices way more limited.
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Re: changing to folding props

Quote:
Originally Posted by Jeff_H View Post
Gori is the worst prop I have ever experienced. ...they have an absurdly high failure rate.
Please describe these alleged "failures." I have never heard of a problem with Gori products.

Quote:
Originally Posted by Jeff_H View Post
My understanding is that Flex-o-fold has similar issues.
Again, I have never heard of any issues with Flex-O-Fold. Both these products are robust, well-engineered pieces of equipment, IMHO.

You sound like a guy with an ax to grind.
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