Originally Posted by thinwater
Spin shackles release, but you wouldn't use one on the jackline end.
The question (Snore's) was specifically about the harness end
1. spin shackles . . . ./ . . They also require 2 hands to be certain.
I guess I am not sure you have ever seen or used a trigger shackle if you think they 'require two hands'. They absolutely do not. They are one hand to close and one hand to release.
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3. As a singlehander I find it hard to think of a circumstance when I would be both wearing a harness (instead of a PFD) an better off released. In other words, released I'm still a deader as I am off-shore or in icy water.
Trapped under the boat, or in the rigging is the classic case where you need a release.
4. Not all spin shackles are releasable under load. This has been proven.
Please show me 'proof' that any of the two most popular trigger shackles (tylaska or wichard) cannot be released under load. They have been used for years in both the Americas cup and Volvo races and are utterly reliable. The T12 (pictured above), for example, is designed to handle and release a 12ton load. It sure as **** is going to be able to release a couple hundred lb tethered body load.
Additionally, with some inflatable PFDs the lanyards are not accessible, also proven.
That would also be true with the kong on those same pfds.
So I use a Kong Tango at the harness end. Under most circumstances it is releasable, though it aint' easy if towed (I tested that at 6 knots).
The trigger shackles are inherently easier to release under load than the kong. To get free of the kong you have to pull yourself forward to slip out of the 'hook'. You do not need to do that with a trigger shackle, just pop the trigger and you are free.
The knog is acceptable for the jackline end, I just don't happen to like it because it mixes aluminum and stainless which I like to avoid in the marine environment, and the aluminum bouncing along the deck (along the jackline) and into cleats and blocks will get dinged up
Some of this always boils down to preference, and I clearly stated in summary that my answers were for me and my application. Others will certainly have different factors to consider. Absolutes are generally not. For example, we could go off-topic and discuss boats where tethers in any form (beach cats, for example) are bad.
Trigger shakles? Certainly I have used them on chutes and they should be good for tethers. However, they are not customarily used for this, I am not aware of commercial
tethers that use them, and thus they were outside of my discussion. Perhaps that was a careless omission and I certainly have nothing bad to say about them. Notice, below, that many people group common snap shackles and trigger shackles as the same, which they are not.
Is the security
of a trigger shackle sufficient that anyone would climb with one? Obviously not. Another poster said he had only expereinced 3 acidental releases with ball releases, and did not state if he had tested the fabric
releases with 1.5x body wieght and cold wet hands; I'm guessing there is a 50/50 chance they may not release at all, from tests I have read, imformation I have been given by gear
manufacturers, and personal expereince. This is an area where a standard test is sorely needed.
Trapped under the boat? Certainly posible. I believe the release action of the Kong is more intuitive to me and that I would not find it to be a problem. I would not expect high loads, as I am not being dragged. For high latitude sailing this is a concern, but for my use, not so much. My opinion for my useage.
Releasability under load. Agreed. Only said folks should not assume all spin shackles are releaseable. I did not say all spin shackles were not releasable nor did I imply that. Nor did I say that a Kong shackle would be better if also inaccesible. I simply stated that people should test their systems, in the water and PFDs deployed, as these are known flaws. I should add that niether my wife or daughter can open the Wichard shacles when wet; their hands are too small. Too bad for them.
Durability of aluminum parts
in marine environment
? Though I am not the most heavy duty user, I've use these for >25 years, replaced a few bits now and then, and been saticfied that increased ease of use and light wieght were worth it. The biners last longer than the tether, anyway, and that is enough. Biners are much cheaper than deck gear
, and the failure rate of UIAA rated hardware
below rated stress is statistically zero.