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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.

In-fes-tim-inal, adj, an infestation of extremely small battery problems. See: extrarodentially and infesterminal

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.

I get it Aard, but there is little we do in modern civilization that does not induce toxicity into the environment marine or land (we are not going back to live in caves) - yet, it appears to be that the biggest polluters get away with it that do 99% of the damage, and recreational boaters who in comparison would release an infinitesimally small amount of toxicity have to follow the rules. Sorry - it's bullsh*t.

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

This is what the CURRENT standard Says; 2.9.3 Additional requirements for lithium ion batteries The following additional requirements apply: (a) Lithium ion batteries shall be installed in locations that ensure the battery manufacturer’s specified operating temperature limits cannot be exceeded and are appropriate for the IP rating of the battery and its management system. (b) Each lithium ion battery shall be provided with a battery management safety system (BMS) either integrated into a battery pack or as a separate component located adjacent to the battery. The BMS shall cont

Thank you Frank. I took the drum into 'Machine Part Welding' in Penrose today (they do repairs on aluminum cylinder heads, amongst other engineering). The engineer described a process almost word for word as you explain above, which gave me confidence they could do the job. Thank you Psyche and aardvarkash10 for helping work through the options. I am not sure yet whether Harken still supply these drums (waiting to hear back). I have found online 2 retailers in the US that have the drum; they are both seeking about $US3.6k (about NZ$5.9k) for the drum plus shipping. There is a 2nd hand wi

My understanding of all the Lithium style batteries, the Marine LiFePO4 are the least fire hazard of all, perhaps even less of a fire hazard than AGM or old style Lead Acid Golf Cart type. Don't hesitate to put me right though - what I know about electrical things is less than Donald Trump knows about how Tariffs work.

1964 documentary series on islands in the Hauraki gulf. A glimpse into a past long gone. The series was reprised in 2018 by the original presenters daughter. Those are also available on nzonscreen. https://www.nzonscreen.com/title/islands-of-the-gulf-rakino-and-kawau-1964/quotes

The Paul Whiting Tribute is being held at the Ponsonby Cruising Club on Thursday May 15 2025. The Whiting designed and built 'Taranui 3' (the plug for the Whiting 47) and the mighty 'Magic Bus' will be on display right outside the club. Viewing of boats and design plans from 5pm. There will be a tribute to this remarkable young New Zealander at 7.00 pm upstairs at the Ponsonby Cruising Club. Come and enjoy our excellent dinner menu and full bar facilities. Intro of Penny Whiting MBE, Tony Whiting and Grant Whiting by Kevin Lidgard. Ponsonby Cruising Club Phone (09) 376 0245

Tomorrow night.

Train as a biologist withe a double major in organic chemistry and then specialise in marine organisms and their susceptibility to different targeted chemicals presented in a semirigid polymer coating. At the moment we are stuck in a double bind. We want a product that deters fouling, but we also want marine environments that support marine life. If you use an effective antifouling and it relies on a poisoning process for effectiveness you will be harming the marine environment. The future likely lies in systems that are purely contact topical and don't wear off so cannot generally

Holy crap. At those prices I'd be making all repair attempts too!! Good luck.

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.

After 30 years in contact with Aluminium I suspect additional shop time might be needed drill out some of the locking grub screws and careful use of heat to extract the bronze ring . They will need to clean the crack surface to thoroughly remove any oxidised material, it can be a surprising amount, they will also remove the anodising around the weld margin. Post repair you will need to get the drum stripped and re-anodised. It looks to be a relatively thin wall casting so distortion might be a risk and as already mentioned the welded area will be weaker than the parent material. It mi

Have you priced up a new drum? Also check what's out there secondhand.

I wonder how the paint shop feels about spraying it on.

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

Thanks motorb, aardvarkash10. I will check out the options during this week. I have identified the cause. There is a bronze gear fixed to the bottom of the drum with stainless fixings. Galvanic corrosion around the stainless fixing has put pressure on the drum. Kicking myself for not spotting it and attending to it. Today's job is to strip the gear from the partner winch, clean and duralac etc. Learnt something new about my boat, the hard way again... kind regards Kieran

Honestly, I'm waiting a few more years for the new sodium-ion battery tech to come into the mainstream. It's got all the benefits of lithium with none of the fire hazard, at only a slight weight penalty. It's already on the market so won't take long for victron etc to catch up. In the meantime, I'll stick with my AGM lead acid. Saving 20-30kg isn't going to make much difference for me (and the weight is low down anyway). OK, that wasn't helpful.... stainless is fine for a battery box assuming there's no chafing or shorting, but where is all the heat and gas going to go if it

Hempaspeed follow-up now that I have a few seasons worth of experience with this product. How often I have to clean and how easy it is varies from season to season. I don't know why marine life sticks better to Hempaspeed some years. Still not hard to remove though but if I wait too long removing barnacles will result in cratering the surface. Hempaspeed flakes as it ages. A little bit during the sailing season and then mostly at the water line. Then more and anywhere during the winter. The flakes separate mid-Hempaspeed, not at the interface to the primer. This year I had to do