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Old 16-08-2016, 18:49   #1
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Using low friction rings.

I would like to rig a jib sheet so I could sheet it either inside or outside the stays without having to re- run the sheet through snatch blocks, around the stays and then back again. I think I see a way using LF rings from looking at pictures of racing boat rigging AND from looking at all the pictures here (wow.) So one of my question is about deck clutter. I have no experience crewing on a racing boat and I have no experience dealing with lines all over the deck, I would trip and fall. I have super narrow side decks so it would be a clutter. Is this a deal breaker or could you bungee your way out of it?
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Old 16-08-2016, 20:45   #2
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Re: Using low friction rings.

You would need a second set of sheets or a really really weird deck layout. If you have devised a system that doesn't introduce a massive amount of friction with one sheet I would love to see it.
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Old 16-08-2016, 21:07   #3
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Re: Using low friction rings.

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You would need a second set of sheets or a really really weird deck layout. If you have devised a system that doesn't introduce a massive amount of friction with one sheet I would love to see it.
Yep, they are "low friction rings", not "no friction rings".

They are higher friction that equivalent ball bearing blocks under load.
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Old 16-08-2016, 22:20   #4
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Re: Using low friction rings.

I agree with Stum. The angle is key. I raced on a super tweaked Hobie 33 this march. The owner is a sailmaker with access to anything. The only place that a ring was used was on a tweaker for the spinnaker sheet with less than twenty degrees deflection. I use one on my continues furler at the opposite end from the drum. There is no load so it works well.
Seems to me that a block could be used in the same way as the ring in the application you are thinking of. Not that I can figure out how you will get it around the shroud.
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Old 17-08-2016, 07:47   #5
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Re: Using low friction rings.

[QUOTE=admiralslater;2of. Not that I can figure out how you will get it around the shroud.[/QUOTE]

I was thinking of another short lazy sheet routed inside the shrouds that I could position with rings to adjust the sheeting angles.
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Old 17-08-2016, 08:02   #6
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Re: Using low friction rings.

A very low cost, but heavy, low friction device is called an electrical spool insulator. These are glass smooth ceramic and typically brown.

victory88.en.made-in-china.com/productimage/kSRnuPwDqEpf-2f1j00PjiQbmZGYYrp/China-Brown-Color-Porcelain-Spool-Insulator-53-2.html
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Old 17-08-2016, 09:22   #7
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Re: Using low friction rings.

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I was thinking of another short lazy sheet routed inside the shrouds that I could position with rings to adjust the sheeting angles.
I would use a block on the in side as the loads/friction will be higher and the ring out side where the loads are lighter. In my opinion a bloc is best in both scenarios, however if you want to fool around with fun stuff like the LFR I understand that as I do it all the time
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Old 17-08-2016, 10:50   #8
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Re: Using low friction rings.

Those rings have the merits of 3D adapting.
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Old 17-08-2016, 11:31   #9
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Re: Using low friction rings.

For metal you would need a coating like anodizing after you made it. Anodizing is a nasty little project.
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Old 17-08-2016, 12:17   #10
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Re: Using low friction rings.

It isn't possible to set up a regular sheeting system that will operate either side of the shrouds. You would need an extra sheet to make that work. Using rings or not won't change things.
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Old 17-08-2016, 12:25   #11
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Re: Using low friction rings.

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It isn't possible to set up a regular sheeting system that will operate either side of the shrouds. You would need an extra sheet to make that work. Using rings or not won't change things.
very true
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Old 17-08-2016, 13:14   #12
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Post Re: Using low friction rings.

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It isn't possible to set up a regular sheeting system that will operate either side of the shrouds. You would need an extra sheet to make that work. Using rings or not won't change things.
It's possible, it's just adds lots of friction and lines.

The sheet runs...
1) clew
2) inside ring (adjustable on a line that can be fully released)
3) forward to a turning ring (also adjustable that can be fully released
4) jib car

So when going upwind inside both of the rings have to be hardened up. This will route the sheet back to the winch. When outboard the two rings are eased and the sheet pulls tight between the clew and the jib car.

So you need two hard points that can handle double the sheet load (the ring attachment points) and add a huge amount of friction because the line direction is changed 180 degrees at each point.

Running a second set of sheets would be far easier, cheaper, and put lower loads on the boat.
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Old 17-08-2016, 14:08   #13
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Re: Using low friction rings.

That's a regular sheeting system ?

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Old 17-08-2016, 16:17   #14
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Re: Using low friction rings.

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That's a regular sheeting system ?

Good god no. But it's possible.
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Old 18-08-2016, 07:26   #15
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Re: Using low friction rings.

Yes it's possible. Low friction rings are really great. I use on the foot of my gennaker, in the bow. You can even check if it's possible to use one as a barber hauler. It will depend on the size of you jib (the overlap).
It's dificult to understand and to explain this systems just writing...
good luck!
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