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Propeller Zinc

 

Does anyone have a favorite source for Propeller Zinc's?

The one I got in the past is "Zinc Acorn Nut 2-1/8 x 1-1/2"

The Marina can get them, but the price is higher than I'd like to pay
 

I just ordered from BoatZincs.com. They have a ¡®micro-thin¡¯ zinc, 1¡± diameter by 11/16¡± thick. I don¡¯t have a lot of room between the deadwood and the prop hub, so this seemed like it ought to work fine. Don¡¯t know if it¡¯ll have enough mass to make it thru a season. Previously we had a Camp brand, which had a nice little copper ball inset for good conductivity, but it was too long and it was a pain to cut/grind to fit. Price on the new one from BoatZinc.com was I think $11.56, but with shipping it ends up being just under $20.

On Feb 7, 2021, at 1:41 PM, Steve Bufe <sbufe@...> wrote:

?Does anyone have a favorite source for Propeller Zinc's?

The one I got in the past is "Zinc Acorn Nut 2-1/8 x 1-1/2"

The Marina can get them, but the price is higher than I'd like to pay

 

I usually go with one like this for my 1 in. shaft with?Atomic Four setup mounted just aft of the cutlass bearing. It lasts through the season for me. You can find them pretty much anywhere?for less than $15.



On Sun, Feb 7, 2021 at 7:08 PM Warren Stein via <wrsteinesq=[email protected]> wrote:
I just ordered from BoatZincs.com.? ?They have a ¡®micro-thin¡¯ zinc, 1¡± diameter by 11/16¡± thick.? ?I don¡¯t have a lot of room between the deadwood and the prop hub, so this seemed like it ought to work fine.? Don¡¯t know if it¡¯ll have enough mass to make it thru a season.? ?Previously we had a Camp brand, which had a nice little copper ball inset for good conductivity, but it was too long and it was a pain to cut/grind to fit.? Price on the new one from BoatZinc.com was I think $11.56, but with shipping it ends up being just under $20.? ?
> On Feb 7, 2021, at 1:41 PM, Steve Bufe <sbufe@...> wrote:
>
> ?Does anyone have a favorite source for Propeller Zinc's?
>
> The one I got in the past is "Zinc Acorn Nut 2-1/8 x 1-1/2"
>
> The Marina can get them, but the price is higher than I'd like to pay
>
>




 

Do you think that acorn zinc would work on this setup?



I don't have any extra threads or much clearance. Maybe if the aftmost nut was also a thin one?

The other option is a thin collar anode, but there ain't much room between the prop and deadwood either. I've heard that for a 1" shaft, you'd really like to have 1" of space between the deadwood and zinc. But that would mean an exceedingly slim 1/4" zinc in my case. The concern is that if there isn't enough space, the cutlass bearing won't get enough water flow and will overheat. For sailing in and out of the marina, that is fine, but my current cruising plans include a bit of motoring for 8+ hours at a time.

?- jeremy

On Sun, Feb 7, 2021 at 1:40 PM Steve Bufe <sbufe@...> wrote:
Does anyone have a favorite source for Propeller Zinc's?

The one I got in the past is "Zinc Acorn Nut 2-1/8 x 1-1/2"

The Marina can get them, but the price is higher than I'd like to pay


 


Jeremy,

I'd go with the collar zinc.? Your pictures show that you have over 1" of shaft showing between the prop and deadwood of the hull.? Collar zincs do come in a 1" size that will fit in there.

The zinc was always an issue for #328 as when we originally got her there was only about 3/4" of gap there.? This forced me to grind down a 1" collar zinc so it would fit in there.? I never had any issue with water getting into the stern tube/cutlass not that we motored a lot.? When it came time to replace the cutlass & shaft I had the prop shop cut me a shaft that was maybe 1/2" longer than the one we cut out which left me plenty of room to put the collar zinc.? What I heard from the prop shop guy was that for a 1" shaft you don't want much more than 1" between the prop and the cutlass bearing - this was more about not having too much unsupported shaft sticking out beyond the cutlass.? It is not ideal to have the zinc squeezed in there but even with the prop spinning I don't think that water getting to the cutlass was ever an issue for us.

In an ideal world I would use a prop nut that had a zinc outer shell instead but I could never find the right size.? I am pretty sure that they make a zinc like this, that has a captive nut for holding the prop on.? The only issue with this is that perhaps every year (or every other year) you will be changing the prop nut.??

Good luck.

Caleb D
T27 #328,?

-----Original Message-----
From: jeremy@...
To: [email protected]
Sent: Thu, Mar 11, 2021 9:32 pm
Subject: Re: [T27Owners] Propeller Zinc

Do you think that acorn zinc would work on this setup?



I don't have any extra threads or much clearance. Maybe if the aftmost nut was also a thin one?

The other option is a thin collar anode, but there ain't much room between the prop and deadwood either. I've heard that for a 1" shaft, you'd really like to have 1" of space between the deadwood and zinc. But that would mean an exceedingly slim 1/4" zinc in my case. The concern is that if there isn't enough space, the cutlass bearing won't get enough water flow and will overheat. For sailing in and out of the marina, that is fine, but my current cruising plans include a bit of motoring for 8+ hours at a time.

?- jeremy

On Sun, Feb 7, 2021 at 1:40 PM Steve Bufe <sbufe@...> wrote:
Does anyone have a favorite source for Propeller Zinc's?

The one I got in the past is "Zinc Acorn Nut 2-1/8 x 1-1/2"

The Marina can get them, but the price is higher than I'd like to pay





 

#226 here. I've had the same issue and found that the micro thin 11/16 thickness?works well.It leaves about 1/4 inch for the cutlass.
I motored up the Hudson and half the Erie Canal without any problems.Now in fresh water?I have to use Aluminum?and they only make that in metric, but a 25mm works fine.
John

Screen Shot 2021-03-12 at 10.20.51 PM.png


On Fri, Mar 12, 2021 at 3:03 PM Caleb Davison via <calebjess=[email protected]> wrote:

Jeremy,

I'd go with the collar zinc.? Your pictures show that you have over 1" of shaft showing between the prop and deadwood of the hull.? Collar zincs do come in a 1" size that will fit in there.

The zinc was always an issue for #328 as when we originally got her there was only about 3/4" of gap there.? This forced me to grind down a 1" collar zinc so it would fit in there.? I never had any issue with water getting into the stern tube/cutlass not that we motored a lot.? When it came time to replace the cutlass & shaft I had the prop shop cut me a shaft that was maybe 1/2" longer than the one we cut out which left me plenty of room to put the collar zinc.? What I heard from the prop shop guy was that for a 1" shaft you don't want much more than 1" between the prop and the cutlass bearing - this was more about not having too much unsupported shaft sticking out beyond the cutlass.? It is not ideal to have the zinc squeezed in there but even with the prop spinning I don't think that water getting to the cutlass was ever an issue for us.

In an ideal world I would use a prop nut that had a zinc outer shell instead but I could never find the right size.? I am pretty sure that they make a zinc like this, that has a captive nut for holding the prop on.? The only issue with this is that perhaps every year (or every other year) you will be changing the prop nut.??

Good luck.

Caleb D
T27 #328,?

-----Original Message-----
From: jeremy@...
To: [email protected]
Sent: Thu, Mar 11, 2021 9:32 pm
Subject: Re: [T27Owners] Propeller Zinc

Do you think that acorn zinc would work on this setup?



I don't have any extra threads or much clearance. Maybe if the aftmost nut was also a thin one?

The other option is a thin collar anode, but there ain't much room between the prop and deadwood either. I've heard that for a 1" shaft, you'd really like to have 1" of space between the deadwood and zinc. But that would mean an exceedingly slim 1/4" zinc in my case. The concern is that if there isn't enough space, the cutlass bearing won't get enough water flow and will overheat. For sailing in and out of the marina, that is fine, but my current cruising plans include a bit of motoring for 8+ hours at a time.

?- jeremy

On Sun, Feb 7, 2021 at 1:40 PM Steve Bufe <sbufe@...> wrote:
Does anyone have a favorite source for Propeller Zinc's?

The one I got in the past is "Zinc Acorn Nut 2-1/8 x 1-1/2"

The Marina can get them, but the price is higher than I'd like to pay








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