Sacrificial Anode

[claymore]

Mine doesn't seem to have sacrificed itself very much for the past year or two - however I have noticed the edges of the propellor are getting a little thin in places. Does this mean that electrolysis likes the taste of my propellor rather than the especially prepared anode that was put there for it and if so - what can I do about it?

<hr width=100% size=1>regards
Claymore
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[Bergman]

No accounting for the tastes of electrickery, but more likely you have too many Ohms between sacrificial anode and prop shaft.

Maybe a wire has come off somewhere in the bowels.

Try measuring with multimeter the resistance between prop and anode.

Or simply fit one of those donut shaped anodes directly to prop shaft behind the prop.

I once accidently knocked a wire off the anode and ruined a folding prop, s/s pin was eaten halfway through. Lucky not to have blade thrown off.


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[perlonious]

i believe there is no real rule of thumb for this it all depends on ....steel piles....next door neighbour....shore power...etc etc ..

i was going to throw one overboard as well on my hunter but instead the round one was wearing well ( about 40 pc ) in one year.....and have added a shaft one now too....

its important to clean the shaft well before putting one on though.

more anodes just mean more money washing away...

i have also swapped most of my electric terminals onbaord now for gold ones..it all makes a big difference.

i would look at your other anodes first and find out the reason why they are not wearing as fast as they should....does the main stud need replacing? ,......is the resistance in the wire too high....hows the engine anode?....


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[Sailfree]

What value resistance should we aim for. My boat is in the hamble - last year with the standard Volvo saildrive propellor (aluminium?) no problem. Last winter fitted a feathering prop (Phospher bronze?). This year after 5 months, when lifted out for another reason, saildrive anode eaten away. Have fitted an additional teardrop anode to hull earthed to gearbox but wonder if the electrical path is too long.


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