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Thread: Tether Hooks

  1. #11
    Join Date
    Dec 2001
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    Grenoble
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    26,512

    Default Re: Tether Hooks

    Quote Originally Posted by Minn View Post
    Yes, they can twist open if snagged on a deck fitting. Forgot the details.
    It is the Gibb hook basically a carabiner.

  2. #12
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    34,362

    Default Re: Tether Hooks

    Quote Originally Posted by Fr J Hackett View Post
    It is the Gibb hook basically a carabiner.
    But a little more secure than the average carabiner, perhaps.

  3. #13
    Join Date
    Dec 2001
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    Grenoble
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    26,512

    Default Re: Tether Hooks

    Quote Originally Posted by pvb View Post
    But a little more secure than the average carabiner, perhaps.

    Not really I much preferred the ones with the internal gate.

  4. #14
    Join Date
    May 2001
    Location
    UK East Coast
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    34,362

    Default Re: Tether Hooks

    Quote Originally Posted by Fr J Hackett View Post
    Not really I much preferred the ones with the internal gate.
    Piccy?

  5. #15
    Join Date
    Dec 2001
    Location
    Grenoble
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    26,512

    Default Re: Tether Hooks

    Quote Originally Posted by pvb View Post
    Piccy?
    Yes

  6. #16
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    34,362

    Default Re: Tether Hooks

    Quote Originally Posted by Fr J Hackett View Post
    Yes


    Seriously, I don't know which type you mean without a photo.

  7. #17
    Join Date
    Nov 2011
    Location
    Sydney, Australia.
    Posts
    4,669

    Default Re: Tether Hooks

    I started the thread because there was a failure on a Clipper yacht (MAIB report still to come) and a man died (even though he was quickly retrieved). The early case, outlined in the PS report linked above, pointed the finger at the hook.

    I believe the information was 'edited' by Morgans Cloud and added to their subscription website AAC.

    But both PS and AAC are N Am centric - that's obviously where the big english reading market is located - and I wondered how much of the investigation into the Clipper failure filtered through to the UK.

    It does not seem very much.

    But moving from the specific to the general - tethers and jacklines do not last forever and there is no indication that people think of retiring them. Ours are all date stamped. We store ours away if we are not on passage - but if offshore they hang from the cabin roof, ready for immediate use, along with LJs. The jacklines are installed when we go offshore.

    The Clipper yacht death occurred in the Southern Ocean - but it was a text book retrieval - he was sadly still dead. The hook failed - hoping yours might not fail is wishful thinking (if you don't know which hooks are suspect. I suspect you could go overboard in the N Sea with a similar result - except it is unlikely we leisure sailors would enjoy a textbook retrieval - increasing the chance of a retrieval of a body.

    The answer is obvious, don't fall off the boat.

    We have had one MOB, scariest time of my life.

    Hopefully Thinwater will be along soon - he did all the work on the PS investigation.

    Jonathan

  8. #18
    Join Date
    Nov 2016
    Posts
    1,797

    Default Re: Tether Hooks

    I, and a couple of mates, followed the reports with more than normal interest. Several of us hoisted in the 'lesson', and made some changes.

    I've switched to a triple-hooked tether for going forward, after the fashion of the very well proven 'Via Ferrata' usage. I have several tethers on board, and make use of them in different places.... such as when seated at the tiller, on watch solo.

    I use climbers' webbing slings, built to international standards. I use the old-pattern Gibb snaplinks as they're the best I can get.

    The probability of TWO of these being prized open simultaneously is vanishingly small.

  9. #19
    Join Date
    Nov 2011
    Location
    Sydney, Australia.
    Posts
    4,669

    Default Re: Tether Hooks

    My understanding is that the the hook 'simply' bent, maybe after being prized open. To me the chance of being prized open is not remote - it is a yacht, anything can happen (and does).

    We, like Zoidberg, have doubled up on tethers - we use 2 x 'double ended' (i.e. 3 hooks, 2 at one end, 1 at the harness and use 2 of tethers for one person). The reason for the 2 tethers - simple - we have 6 harnesses, we only sail the 2 of us offshore - no use carrying spares and not using them. I actually use a climbing harness, the rest are chest harnesses.

    Without starting another, or different debate, we have had seas breaking over our cabin roof and if you were working on the foredeck in such conditions - belt and braces seems the way to go (or not go ) as you could slide at considerable speed - and go straight over the lifelines

    Our jackstays are secured to the bow and transom horn cleats and we have 2 further jackstay from each bow, diagonally to the mast (its a cat). We have 4 'U' bolts in the cockpit roof and one each at chest height either side of the 'patio' doors.

    Jonathan

  10. #20
    Join Date
    Dec 2013
    Location
    Deale, MD, USA
    Posts
    1,498

    Default Re: Tether Hooks

    a. The tether standard was re-written in 2009 to include impact standards. If the tether is older than that it probably transmits excessive impact force and will either fail or injure the user. The changes were made in response to several failures. If your tether is older than 2009, RETIRE IT. Most older tethers failed the new ISO 12401 standard when new. http://www.ussailing.org/wp-content/...ety%20tips.pdf

    b. The Spinlock/Gibb failure was at a mere 500 pounds. This can be either a cross load OR the jackline hooking in the gate area (nose-hooked). Judging from the direction of the Clipper fall, this latter is actually quite probable (see second video, below).

    c. The Spinlock hook also has a problem with opening on U-bolts. This is a failure to meet the standard. Watch the first video on this page. It unclipped at about 20 pounds.
    http://sail-delmarva.blogspot.com/20...that-isnt.html

    If you asked a climber or industrial worker to use a Spinlock hook they would laugh at you. It does not meet any of the required standards. This is sad, because MANY clips do, such as the new Wichard Proline and Kong hooks. AND these are even easier to use one0handed, with gloves, than the Spinlock hooks (they are climbing designs--climbers never have two hands free!).
    Last edited by thinwater; 09-02-19 at 05:55.

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