A couple of weeks ago, whilst laying up our Mystery in the Corfu Boatyard, I saw that the guy next to me had lowered his ground tackle onto a piece of ply. Being a nosy so and so I wandered over and took note of his method of connecting his anchor to the chain! Stainless shackle from the anchor to a stainless swivel, stainless shackle to the chain.
In Alex & Daria's excellent book 'Happy Hooking The Art of Anchoring' they do not recommend the use of swivels and I quote "We do not recommend the use of swivels on an anchor rode. Under normal circumstances you do not need it. Whether you have a chain or rope rode, it should untwist all by itself when you weigh anchor obviating the need for a swivel. Perhaps the only circumstance where you might consider adding a swivel would be if you were to anchor your boat for a very long period of time. Then, just as in a permanent mooring setup, you should incorporate a heavy duty swivel, as your boat is liable to swing around many times."
They also write and once again I quote "Many people opt for a shiny stainless steel shackle. Just consider that stainless steel is, by its very nature, smooth and the pin is thus actually inclined to unscrew itself. We would suggest using a galvanized shackle instead. As the galvanized shackle's surface is rough it tends to bind and not open easily.
Whatever you wind up using, make sure the shackle pin is secured or 'moused' with high grade monel wire. As opposed to stainless steel or copper, Monel® is inert and will not react with metal shackle."
As we all know stainless steel can rust and it's in hidden spots that are not easy to inspect. If, for whatever reason, you do need a swivel and you want stainless, go for the best i.e. Kong but inspect it on a regular basis for signs of rusting. As for me I have taken on board the advice from 'Happy Hooking' and fitted a galvanised fixed connector for my Vulcan (has the dig in/holding quality of the original Rocna, but with no roll bar and therefore clears my bow sprit). I used Loctite on the threads of the swivel for security and of course peace of mind!
Mid November I go under the surgeon's knife and hopefully, with my new hip joint bedded or properly dug in, will be back in the sail loft before too long. To keep me out of mischief whilst laid up I have Happy Hooking to reread. I also intend to delve into Marine Diesel Basics that I skimmed through and blogged about last week, over 200 pages and excellent drawings on most subjects. Incidentally, when down in the local boatyard today, I did notice and photographed the danger of leaving a rodent or bird entry, as per the illustration in last week's blog!
If that isn't enough 'Splicing Modern Ropes' is on my reading list as well. All I need now are some short lengths of offcuts, be it Dyneema or similar high tech rope, borrow Andy's fids and D scissors and before you know it (I hope) I will be making up some soft shackles and loops. Once again, like the Diesel basics book, loads of very informative and easy to follow pictures/text.