Shaft zinc or cutter? Only have room for one.

8943post

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Fortunately we haven't had any issues with the 33 Duffy Atlantic Boat built for us last year...except one. After finding a shaft coupler out of spec and causing a vibration, ABoat replaced the coupler but forgot to put the shaft brush back in place. As a result corrosion ruined the prop which was replaced with an apology and no charge by ABoat last month.

The present issue is that there isn't room for both a cutter and a zinc on the shaft. Will I be OK with just the shaft brush and no zinc? I'd like to keep the cutter but only have room for one or the other.

Thanks
 
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jerseysportfisher

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I agree but won't the shaft brush work the same as a shaft zinc? Hate to lose the cutter.

correct, the brush is tied in with the bonding system, in which should be tied in with the big zinc plate on the transom. I do suggest using a shaft zinc, for redundancy as all it takes is corrosion on one of the terminal end to knock out a brushes effectiveness. I also feel you should check the brushes continuity atleast twice a season if that is your only form of shaft protection
 

jerseysportfisher

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also good for redundancy is prop nut zinc


PropNut.jpg

GB32-Propeller-After.jpg
 

8943post

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Shaft brush should be enough. Why is there so much stray current where you are that it ate your propeller up though, that's troublesome.


New Bedford harbor filled with steel hulled F/V's, probably stray current from them and our marina. We're moving to Fairhaven Marina...hopefully the stray current issues won't be so bad there.
 

traditions

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What do you have for a outside bearing holder? How much room do you need?I have cut some of the cutlass off with a sawzall before to gain some room for both.Some times you can turn a little off the zinc also,or use the nut zinc.
 

southport05

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I'm over at Pope's Island Marina, and we don't have anywhere near that kind of problem with stray current. Hopefully your move to the shipyard will help a lot.
 

greg

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I assume you have looked at the low profile zincs as well? They only take up an inch or so of shaft as opposed to 3 or so for the standard shaft zincs.
 

8943post

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Thanks Jerseysportfish...found a local company here in Mass., boatzincs.com , who sell the propnut zinc. Shaft brush and propnut zinc should ward off the electrolysis devil and allow room for the cutter!
 

Dano62

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I'd never heard of a shaft brush/wiper until I read this thread. Seems like a pretty good idea. Anybody that is using one, I'd like to hear about how it's worked out for you, particularly if your using it without a shaft zinc. Even when you install a shaft zinc properly, it's kind of a crap shoot as to how long it will stay on, especially if you've had a piece of rope in the wheel. I don't have any stray current/galvanic corrosion issues, but I'm leaning toward trying the shaft brush/wiper. Looking on line, I've seen a simple ones priced between $40 and $90. Anybody recommend a particular one/best place to get one?
 

MDI45

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Dano62,8943post is correct....west marine sells pro.mariner shaft brush for 29.99...and it works great
 

Dano62

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Dano,you need to use a Godfrey collar zinc.They have a bronze collar that tightens up on the shaft.They aren't cheap,but neither are propellers.Hows things on Beals Island?

I looked at the Godrey Collars a few years back. They definitely look like they would be an improvement over the standard collar zinc, but I don't have the room between my prop hub and the end of my Cutlass bearing housing.

Things are still pretty quiet here on the rock. A few guys have set off, but not too much happening. It'll be a few more weeks before I put anything down.
 
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