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Forum: Deck hardware: Rigging, Sails & Hoisting

20-04-2015, 11:14

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

That belongs in my other thread. Looks very cool and very similar to what I am doing. Are you finding 2:1 purchase enough? Do you like the way it works?

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 11:37

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

Cool!

Do you have a drawing of your system?

Will you be able to adjust the height of the ring from the cockpit, or not?

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 11:20

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

Another issue is that a smaller diameter line will turn better over a given radius ring.

But I'm not sure any of this matters -- 8mm polyester will also be fine.

I think bottom line is probably...

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 10:55

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

It's a good question.

I definitely don't need Dyneema for strength -- the loads will not be great with all this purchase.

So cost would tend to indicate polyester double braid. On the other...

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 07:02

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

Yikes -- that would be a bad scenario.

I guess I could use two rings below, if this happens.

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 07:01

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

The pic is good! Yes, it would be like the left-hand one, so no chafing in the upper ring.

In the lower ring, as one can see from your drawing, the second loop of the twing doesn't loop all the...

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 06:59

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

Concerning the loads:

The sheet load of the blade at 40 knots is 1,700kgf. At a 60 degree deflection angle (the most we can imagine here), that makes 850kgf 1,700kgf of load on the twing. [edit: ...

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 06:07

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Re: Double Purchase Through Single Low-Friction Ring

Yes, also a low friction ring, attached to a tang on the plunger car.

The end of the twing will be spliced around the outside of the upper ring. It will go down and loop through the lower ring,...

Forum: Deck hardware: Rigging, Sails & Hoisting

12-04-2015, 05:17

Replies: 19

Double Purchase Through Single Low-Friction Ring

Views: 7,965

Posted By Dockhead

Double Purchase Through Single Low-Friction Ring

Does anyone see a problem running more than one line through a single low-friction ring, in order to increase purchase?

I suppose I could rig a second ring, but I hardly see the point -- the lines...

Showing results 1 to 9 of 9

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