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Old 06-09-2022, 14:19   #1
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Help defining an item. Something to do with sailing or boating in general

These are related to the marine environment as far as sailing or motor boating.
I have a couple of these, and I don't know what they are used for.
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Old 06-09-2022, 14:55   #2
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Re: Help defining an item. Something to do with sailing or boating in general

I'm going to go out on a limb here and give it a wild guess.

Those half moon shaped discs with the bent edges on either side of the strap appear to be designed to clip around something.

So this is my guess, they clip around the jib sheet track, or maybe even mainsheet track, where they can be placed anywhere. The center triangular piece is where you clip another pulley block with a U bolt.

For instance, if you were to partially furl your jib, ideally, you would also move the jib sheet car forward, but can instead insert this device and attach another jib sheet block. Jib sheet blocks are available that allow you to open the side of the block to insert the jib sheet.

Ok, that's my stab at it.
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Old 06-09-2022, 15:24   #3
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Re: Help defining an item. Something to do with sailing or boating in general

My WAG:


It's a lifting device of some sort. Two of them attached fore and aft to haul something out of the water? The two "hooks clip over the edge of something and a handy-billy or hoisting line is clipped to the ring. As long as there is tension on it, it will be reasonably secure as a hoist, but not if it is used in a situation where there is an intermittent load.
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Old 06-09-2022, 15:25   #4
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Re: Help defining an item. Something to do with sailing or boating in general

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Jib sheet blocks are available that allow you to open the side of the block to insert the jib sheet.
Yes, they come as plain or trunion snap shackles. Useful for moving about on toerails, for spinnaker sheets and guys, too. I have never seen one of the objects shown, but I think MicHughV has made a super guess.

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Old 06-09-2022, 15:51   #5
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Re: Help defining an item. Something to do with sailing or boating in general

I'd guess it clips into the sail track on a boom and hangs below. Used for attaching preventer down to toe rail or deck.
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Old 06-09-2022, 15:52   #6
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Re: Help defining an item. Something to do with sailing or boating in general

Well as I also have such a thing

It goes on the boom and slips into the sail track and then a 4-1 goes to the bottom of the mast and becomes a vang
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Old 06-09-2022, 17:09   #7
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Re: Help defining an item. Something to do with sailing or boating in general

Remind me of battery lifters. Trojan batteries come with a combination inverted T, horizontal slot in the lifting lugs.
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Old 06-09-2022, 17:17   #8
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Re: Help defining an item. Something to do with sailing or boating in general

I hate to be pipped at the post, but what AKA sez makes sense....those clips would wrap around the boom, and clip into the sail track on top of the boom, with the curved shape of the boom providing the necessary tension to keep the clips firmly attached. ie, pulling the clip firmly into the track.

I don't see it as a vang attached though, as the forward pull of the 4:1 rope would likely try to twist the item so that the clips would not necessarily be parallel to the track and would also try to pull the item forward as it is not restrained in the track to prevent fore or aft movement.

I lean towards this attachment being used to attach a preventer line when running downwind as per Jeff above, as the applied load would be directly down.
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Old 06-09-2022, 17:21   #9
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Re: Help defining an item. Something to do with sailing or boating in general

A final thought. The two clips don't appear to be very far apart on that strap. Looking at the photo I'm doubtful it would go around the boom of any 40 footer. It seems to be made for a smaller boom and likely a smaller boat.
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Old 06-09-2022, 17:49   #10
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Re: Help defining an item. Something to do with sailing or boating in general

In the 70's this device was used as a boom vang attachment. The two curved pieces clamped around the boom fitting into the boom slot. Don't know what it was called.
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Old 06-09-2022, 18:06   #11
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Re: Help defining an item. Something to do with sailing or boating in general

If it was used as a vang attachment...what is there to provide forward movement when the vang was tightened ???
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Old 06-09-2022, 18:07   #12
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Re: Help defining an item. Something to do with sailing or boating in general

I meant to say "prevent" forward movement...occasionally my brain detaches from my eyes
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Old 07-09-2022, 13:31   #13
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Re: Help defining an item. Something to do with sailing or boating in general

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Originally Posted by MicHughV View Post
A final thought. The two clips don't appear to be very far apart on that strap. Looking at the photo I'm doubtful it would go around the boom of any 40 footer. It seems to be made for a smaller boom and likely a smaller boat.


My boat is a tiny one and they don’t slip once you put pressure on them

The slack in the middle is pulled out and tightens against the bottom of the mast

Sorry no pix right now but if you want I can get a pix next time I’m at the boat
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Old 16-09-2022, 17:14   #14
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Re: Help defining an item. Something to do with sailing or boating in general

AKA-None:
That would be great to see a picture of it attached to the boom. I have some booms around the boat yard. I will do some tests.
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Old 16-10-2022, 14:10   #15
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Re: Help defining an item. Something to do with sailing or boating in general

Ok now to get the photo from my phone to this forum
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