prop shaft

[soerencarlsen]

I allways get good replyes here :-) so now I have a bronze shaft 1 1/8" and bronze propeller SS strut where do I put the zink anode on the shaft or strut? allso it seems hard to get any for that size shaft.
Soren

[fstbttms]

Originally Posted by soerencarlsen

I allways get good replyes here :-) so now I have a bronze shaft 1 1/8" and bronze propeller SS strut where do I put the zink anode on the shaft or strut? allso it seems hard to get any for that size shaft.

Your shaft will need the protection of an anode or two. Your strut may not. In any event, installing an anode on the strut provides no protection for the shaft, as the strut is insulated from the shaft by the cutless bearing.

Here's a good place to find most anodes, including a 1 1/8" streamlined collar (which should not be difficult to source in any case):

https://www.boatzincs.com/shaft1-sizes.html

[soerencarlsen]

Originally Posted by fstbttms

Your shaft will need the protection of an anode or two. Your strut may not. In any event, installing an anode on the strut provides no protection for the shaft, as the strut is insulated from the shaft by the cutless bearing.

Here's a good place to find most anodes, including a 1 1/8" streamlined collar (which should not be difficult to source in any case):

https://www.boatzincs.com/shaft1-sizes.html

Thanks. Forgot to mention I am located in Denmark, so even a bronze shaft needs the zinc anode .

[fstbttms]

Originally Posted by soerencarlsen

Thanks. Forgot to mention I am located in Denmark, so even a bronze shaft needs the zinc anode .

Not sure what being in Denmark has to do with it, as every prop shaft needs some sort of cathodic protection.

[billknny]

You need an anode on the shaft. If there is provision for fitting on on the prop, that would not hurt as well.

IN ADDITION, I would add one to the strut. If it is electrically totally isolated from all the other metal in the boat, putting an anode on it is less important, but will still help protect against pitting.

[fstbttms]

Originally Posted by billknny

IN ADDITION, I would add one to the strut. If it is electrically totally isolated from all the other metal in the boat, putting an anode on it is less important, but will still help protect against pitting.

My philosophy has always been; unless there is a compelling reason to add an anode where there wasn't one previously- don't. Especially on the strut.