Anode wear

[Ex-SolentBoy]

We have a large hull anode, and a smaller circular one on our Maxprop.

After some 8 monts immersed there was quite a lot of wear on the Maxprop one, but almost no wear at all on the hull one (picture attached).

We have checked proper continuity of both anodes and there is virtually no resistance on all the connections.

Is this something to be concerned about? Is it just a case of the fact that the prop anode is right near the prop and the electrons take the shortest route?

At this rate a hull anode will last me 5 years?

 

[Tranona]

This not unusual. That is a very big anode and probably not necessary. Your Maxprop will eat its anodes because of the mix of metals, but I would suggest there is nothing else for the hull anode to "protect" so it won't erode.

 

[Caer Urfa]

At this rate a hull anode will last me 5 years?

Hello Solentboy

Somethings not right!

Not sure what engine set up you have but one thing to look at is do you have a flexable coupling after your gearbox.?

Many people forget that if you have a flexable coupling then there is no electrical contact between the engine block (where the hull anode is probably wired to) and the shaft/prop.

You need to wire a short link between the head of the bolt on one side of the coupling and the nut on the other side of the coupling, it needs to be shortest possible and a tight fitting so it does not have any chance of catching anything while the shaft rotates.
Hope this might help

Mike

 

[Ex-SolentBoy]

Hello Solentboy

Somethings not right!

Not sure what engine set up you have but one thing to look at is do you have a flexable coupling after your gearbox.?

Many people forget that if you have a flexable coupling then there is no electrical contact between the engine block (where the hull anode is probably wired to) and the shaft/prop.

You need to wire a short link between the head of the bolt on one side of the coupling and the nut on the other side of the coupling, it needs to be shortest possible and a tight fitting so it does not have any chance of catching anything while the shaft rotates.
Hope this might help

Mike

Thanks. We have an electro-eliminator that does that job, and the continuity is fine.

 

[Ex-SolentBoy]

This not unusual. That is a very big anode and probably not necessary. Your Maxprop will eat its anodes because of the mix of metals, but I would suggest there is nothing else for the hull anode to "protect" so it won't erode.

Ok, thanks.

Its a shame it isnt the other way round. The only reason I need to haul out is the maxprop anode. I think I shall move my Scuba gear on board!

 

[Elemental]

Ok, thanks.

Its a shame it isnt the other way round. The only reason I need to haul out is the maxprop anode. I think I shall move my Scuba gear on board!

I routinely change my prop anode (which doesn't last a season) using a mask/snorkel whilst the big brute on the hull lasts for years...

 

[Ex-SolentBoy]

I routinely change my prop anode (which doesn't last a season) using a mask/snorkel whilst the big brute on the hull lasts for years...

I would do that, but as a have a permanent wetsuit made out of bioprene I keep on popping to the surface!

And I can't hold my breath either.

Is there a way of putting Loctite on underwater?