I have the small suggested zinc on my prop. The fellow that cleans my hull suggested adding extra protection via those that have a zinc fish on one end and a battery jumper cable clamp on the other. Not sure where I would clamp the battery jumper cable type clamp to do the job.
Accessory zincs to prevent corrosion
- Thread starter drmendbone
- Start date
To be effective, any zinc has to be in direct electrical contact with the item being protected. The shorter and more direct the electrical path, the better the protection. You could attach the guppy to your prop shaft, for instance. If I am not mistaken, the rig in a Beneteau is also bonded to the engine/shaft/prop, so in theory, the guppy could be clipped to a shroud or backstay.
That said, your best bet is to have your diver install a limited clearance shaft zinc. These are available especially for the French boats, which often have very short runs of exposed prop shaft.
http://www.boatzincs.com/beneteau-donut-collar-specs.html
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Here is another shaft zinc that I use - with the limited exposed length of shaft I was originally deciding between a zinc and a line cutter - wanted both as the prop zinc seemed less than required.
Solution;
http://www.marineanodes.com/browse/cutter/1
Bob
Solution;
http://www.marineanodes.com/browse/cutter/1
Bob
Those zinc fish are useless on a beneteau; there is no convenient way to attach them to the ship's ground. The rig (shrouds) are grounded to the keel, and only for lighting strike purpose. Use the narrow zinc shown, and consider aluminum in lieu of zinc to provide better protection.
Bad advice.
Aluminum "in lieu of zinc" is a poor choice in salt water where the OP's boat is located.
Also, "convenience" should never be a consideration. If you want to use a supplemental zinc, find a way to route it directly to the shaft which is often near the water intake seacock. If convenience is a concern, they are usually co-located It's simple to remember to connect the zinc and shut off the seacock when leaving the boat and equally easy to disconnect/open when running the boat.
Beneteau's of this vintage, with their limited, smallish anode mount locations, and expensive folding props need an aggressive anode - aluminum. As an added benefit the aluminum anode doesn't "salt" up with that white coating like zinc anodes. The coating further reduces the effectiveness of zinc.