Need Advice on Feathering Prop Repair - SailNet Community

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  #1  
Old 03-20-2012
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Need Advice on Feathering Prop Repair

To repair, or not repair? That is the question.

My (new to me) Hunter 31 has a Martek 2-blade feathering prop (Model 18R767) on it. I disassembled it before she goes back in the water to inspect and grease it up. Upon doing so I found that the forward stop in the inner hub is chipped. Most likely from somebody slamming it from Reverse to Forward without reducing throttle.

You can see the chipped/mushed stop at the top of the photo and the adjustable stop pin that it mates up to at the bottom of the photo.



Another close up of the damage:



Here's a picture with the inner hub rotated around so that the stop face is mated to the stop pin. (No doubt my terms are off...I just made them up!)



Anyhow, you can see that the stop contacts about 1/2 of the pin. Note that it will never contact 100% of the pin because of the basic configuration of it.

I didn't find any chips floating around in the assembly, nor did I find any mauling or problems with the prop or hub's gear teeth. Maybe it came out in one of the lumps of grease I cleaned out when disassembling.

I could build up the chipped/mashed area with braze, then grind it down to bring it back to the original (or close to it) spec. Question is, whether that is worth the time and effort to do? It would only increase the contact area between the pin and stop by a small amount...and of course if not aligned perfectly would actually reduce it and put more stress on the stop.

Comments...suggestions anyone?

I'm especially interested to hear from anyone with direct experience with these props. Could this existing situation set up any unwanted vibration in the system?

Last edited by Canadaler; 03-20-2012 at 02:48 PM.
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Old 03-20-2012
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Lightbulb Re: Need Advice on Feathering Prop Repair

I have used a two blade Martec feathering prop for a decade. Whenever I had a question I just called up Martec. Very helpful folks. I sent it in once for refurbishing and to have the balance checked.
"Preventive Maintenance" and Not too expensive.

It's a good product, and when we find some spare b.u.c.'s we will get a three blade version someday.

So give 'em a call and forward your pictures to them for an assessment.

Hopefully that part is not too expensive to repair or replace.

Regards,
L
Faster likes this.

Last edited by olson34; 03-20-2012 at 06:32 PM.
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Old 03-21-2012
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Re: Need Advice on Feathering Prop Repair

olson...thanks for the advice.

I talked to Gary at Martec today and he was very helpful. The chip probably doesn't impact the performance of the prop, but I'm going to take his advice and get the Delron bearings replaced and check the balancing on the unit.
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