Psyche

15? Amateurs...

At that price, I would definitely be trying a repair! What kind of boat are they from, they must be pretty big.

This is called taking the law into one's own hands, its vigilantism against bottom hugging greeblies 😁 It's what happens when there is a failure in policy which is unacknowledged and a need to take action, I have no doubt that if there was a glow in the dark additive that was easily available such as tributyltin, people would use it.

This has been mentioned before but there is no coordinated policy to control biofouling. If the govt wants less poisonous leaching from underwater coatings then failing a breakthrough in technology (let's face it, despite millions spent on R&D there's nothing but vague promises and aspirations) there needs to be concomitant policies that enable boat owners to clean their vessels easily, regularly and economically. Instead we have the removal of hardstands, grids, poles etc, the increase in fees to use existing facilities and an acknowledged decreasing effectiveness of coatings. Now so

I dont think this is an economical or practical repair in the long term even in the best case scenario, that said you could go down the quick and dirty route and just get it welded as is. File and sand to an acceptable finish while you find a secondhand winch.

Yet for the entire history of yacht batteries in NZ they are in wooden boxes under a bunk with no outside vents fuming away under the squab usually. Number of FLA incidents compared to boating hours is infestiminal.

Definitely one for an engineer to deal with. I am not sure of the best method but probably grind the crack to a vee shape clamp the drum to make it tight against the gear then spot weld to hold it together. Remove the gear and complete the weld. The next step may be to put it in a lathe to clean it up, then refit the gear... Allow a couple of hours.

quite a crack!, step one is drilling a 3mm hole at the end stop it getting worse. Try taking it to an engineer but I am doubtful an adequate repair can be made, heating changes the temper of alloy and there are teeth inside the drum that will be softened in the process leading to failure, probably at a highly loaded moment

It appears the success of CC depends very much on how its applied and where the vessel lives, also on expectations as some people have no idea that all antifouls coatings require at least some cleaning between haulouts.

I doubt that a battery box is going to help much to prevent fire, as the heat has to go somewhere but anyway I went down the rabbit hole of trying to find out what the legislation says with regard to lithium installations. My conclusion is that they really don't want you to know! How about $186 for a copy of the standard https://www.standards.govt.nz/shop/asnzs-3004-22014

Worth a try, a lot depends on the type of aluminium, have you got a picture?

Copper coat is the modern version but there is a reason it hasn't taken the world by storm

I will stick with paint

I met Drew Smith while he was in Westhaven getting his 34 ft boat ready for the leg from AK to Rapa-iti, a trip of about 2500 miles. Here's his website https://farotherside.com/ His route is something like this He said he needed to head south to catch the westerlies before going north, he cleared customs on Easter Sunday. The weather eased for a few days before the next system came through, here is the next system He sent me message saying all is well, and while we are all tucked up and warm I can't help but spare a thought for Drew out there on his own