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How many shaft anodes?
- V12diablo
- Deck Hand
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How many shaft anodes?
Jason
- bud37
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Re: How many shaft anodes?
- buster53
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Re: How many shaft anodes?
Hopefully, someone knowledgeable will chime in.
- Midnightsun
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Re: How many shaft anodes?
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Re: How many shaft anodes?
The most anodes I've seen on each shaft is 2. IMO, if you need 5 per shaft, it's probably a Band-Aid for a problem that should be corrected. There's also the possibility that a previous owner figured he wouldn't have to hire a diver or get a haul out to change them as often if he just added more. This is a no no of course but we don't know if that was the reason or not. Usually one anode on each shaft and a transom anode are enough in a trouble free dock. You can try that then make observations throughout the season on anode and hardware corrosion (shafts, rudders, props, struts, etc.). If it looks like you need additional protection, you can add trim tab anodes, or rudder anodes. If after all that you still have a problem, you really need to determine why. If your anodes end up half their size in less than a season, it's usually a pretty good sign you're under protected by either not enough anodes or there is a problem causing them to give up their mass at an accelerated rate.
It's a complicated subject with an endless number of variables. No one answer suites everybody's set of conditions.
- km1125
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Re: How many shaft anodes?
I've only ever seen 1 per device (shaft, rudder, tab, etc). I might see a need for two if the shaft was VERY long or segmented but that would be pretty rare too.
I would also think that those extra four, especially if on both sides, would add a lot of drag to the running gear and eat up a few MPG at speed.
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Re: How many shaft anodes?
- bud37
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Re: How many shaft anodes?
Now if the boat will end up in in salt going from salt, then zinc would be preferred, and I would replace all anyway cause clearly there may be a problem, zincs can get a coating rendering them ineffective ....they are cheap enough to go all new.....much cheaper than props/struts/rudders/thru hull fittings etc.
To add to all this, further investigation is necessary while the boat is on the hard, go about and test continuity from all the anodes to the boat ground to make sure they will be able to do their job efficiently.The transom divers dream should be checked also.This is the perfect time to inspect and clean all the bonding connections to engine ground and all the hull fittings, see if someone cut something.
Remember whatever situation you find yourself in, all the anodes should be matching materials.....good luck with your refit.
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Re: How many shaft anodes?
km1125 wrote:Source of the post ....I would also think that those extra four, especially if on both sides, would add a lot of drag....
Totally agree km, not to mention that you can actually cause a wobble in the shafts which will likely become more pronounced as each anode wears at a different rate and causes an imbalance.
Sooo many things at play here, even how fast the water's current is plays a roll in how much protection you need.
- V12diablo
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Re: How many shaft anodes?
bud37 wrote:Source of the post Where will the boat end up....fresh water or salt ?
Fresh water,, Erie Canal and upstate NY lakes., it was in brackish water previously. I don’t mind replacing all of them, I do believe they are magnesium , is there a way to check? I planed on replacing them as I already removed the shaft anodes. I can definitely check the wiring and continuity on everything while it’s out.
Jason
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