Help! Metric prop shaft creating road block! 1972 Dufour Arpege. - Page 2 - SailNet Community
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post #11 of 27 Old 11-30-2009 Thread Starter
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OK. I'm giving up on the local prop shops. Base on the e-mails, I'm going to buy a used prop and take it to a regular machine shop and have them bore the prop for a ISO Metric Taper 10:1 on a 25mm shaft.

Should that work?
Or do I need to give them more info?
Where do I buy the metric prop nuts?

I've managed to figure out that the prop should be a 12 x 7 fixed three blade.

Thanks for the help so far.
Lawson
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post #12 of 27 Old 11-30-2009
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Well

I would really take the time and find a metric prop as they will have the nuts also and there is NO saying for sure it is that taper it is just what shows up as a standard when searching.

Having spent most of my life in a machine shop its not that simple to change the taper in and existing part

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post #13 of 27 Old 11-30-2009 Thread Starter
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What about an Anchor Metric-to-SAE Propeller Bore Reduce Bushing?
It takes a 1 1/8 inch down to a 25mm. I'd still need to locate a 25mm prop nut. What about the ones Beneteau uses

Bushing
Anchor Metric to SAE Propeller Bore Reducer Bushings

Beneteau Prop Nut
Canada Metal - Beneteau Propeller Nut Anodes
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post #14 of 27 Old 11-30-2009
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Quote:
Originally Posted by lawsonmitchell View Post
What about the ones Beneteau uses
+1 on not using a non-metric prop. The correct solution to your problem is to use the right prop. Anything else is a band-aide.

Regarding the Beneteau prop nuts; these are not standard prop nuts and require a special washer to secure the prop and nut. It does not use a cotter pin. You could use this nut, but why? They are not superior to the usual double nut and cotter pin setup.

I find it hard to believe that you cannot find a metric-bore prop and the nuts to go with it. These are not uncommon items and any prop shop worth its salt should be able to provide them with no trouble.

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post #15 of 27 Old 11-30-2009 Thread Starter
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FastBottom,

Me too. I've done everything short of begging. There are three "reputable" shops in our area. None of them want to mess with it. I can't figure it out. I mean Beneteau, Jeanneau, Bavaria and Dufour to name a few all have metric setups, right? Just so I'm reading you right, You are opposed to the bore reducer bushing, Yes?

Thanks,
Lawson
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post #16 of 27 Old 11-30-2009
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You have to Google and follow up the hits which i gotta say are not that good on the 25mm

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Last edited by tommays; 11-30-2009 at 02:42 PM.
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post #17 of 27 Old 11-30-2009
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Quote:
Originally Posted by lawsonmitchell View Post
I mean Beneteau, Jeanneau, Bavaria and Dufour to name a few all have metric setups, right? Just so I'm reading you right, You are opposed to the bore reducer bushing, Yes?
Metric running gear is very common. Nothing unusual about it.

While the bore reducer will probably work just fine, I'd be concerned about it insulating the prop from the shaft and the protection provided by the zincs mounted there.

There is no compelling reason to not use a prop designed to fit on your 25mm shaft.
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post #18 of 27 Old 11-30-2009 Thread Starter
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Fast Bottoms,

You say, "There is no compelling reason to not use a prop designed to fit on your 25mm shaft." I agree. But no one I've talked to yet (about 30 different shops) knows where to get metric prop nuts. A couple are looking into it. And I can't find any online. Do you have any resources? Also, the anode will have to mount on the prop nut as there is only about 1/2 inch of exposed shaft available between where the prop ended and the stern tube begins.

See pic at:
http://isurus.mote.org/~lmitchell/4D...3768eb73d0.jpg

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post #19 of 27 Old 11-30-2009
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I just got off the phone with the manager of Bay Propeller, which is one of the largest prop repair facilities on the West Coast. He told me that metric-bore props are not something they sell! I am shocked. He said that you will likely not be able to find a new, metric-bore prop and that the bore reducer is the best way to go. I asked him about new nuts and he said they also would be hard to find, although they could fabricate something if push came to shove.

Well, I guess you learn something new every day. Maybe your best bet is to go with a larger standard prop and a bore reducer. Regarding the nut, you can buy the Beneteau prop nut and the zinc that goes on that. For additional protection, Boatzincs.com does sell limited clearance shaft zincs that will fit in the very small length of exposed shaft your boat has.
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post #20 of 27 Old 11-30-2009
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I made a call also and the issue is it does NOT pay for them to have a metric machine setup as its so rare for them

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