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Bananabender said..
What's the go with aluminium hulls and electrolysis one hears all kinds of stories of the effects especially in marinas. If I remember correctly
Lou Abraham's Challenge 11 was aluminium and a crew member told me after one race ,mind you that was at the bar and one or twenty beers later, that they hung zinc anodes over the side when tied up. Old wives tale?
There are lots of stories! I had a Star alloy fishing vessel in the 80's that I had built when I left the navy. I wish I had left it bare alloy. Had to chase up the right antifoul and use the right skin fittings but there was never any problem with electrolysis until one of the other fishing vessels tied up alongside with copper in his antifouling. Ended up with "Two Bob" marks along the waterline. Mates alloy Cole 42 was built about 1980 and he found washers and all sorts of crap in the bilges but no signs of electrolysis. The Cole is now in bare aluminium. He did remove some excess anodes though. I have seen a 45 foot cruiser have two sheets welded into the bow at the anchor well where the anchor had been resting.
If I had an aluminium yacht I would take it back to bare aluminium like Pen-Duik-5