Right lay wire

[csandys]

Curious, why does it have to be right hand lay? Is normal 1x19 left hand lay?

[Stumble]

The reason I need right hand lay is that the roller furler turns clockwise. So a left hand lay wire will open up as the drum spins. The 1x19 is just because it needs to be a very stiff wire in order to support the luf of the sail.

[csandys]

What happens when you roll up the sail counter clockwise?

[Brion Toss]

Hello,
That's a most unusual question. If the wire is somehow involved in furling, then it is unlikely to be a unit that you would want to use; there should be no torque on the wire for a conventional system, as there the foil rotates around the wire, and does not torque it. And even if this system somehow does involve torqueing the wire, 1x19 is not designed to support that kind of load. And even if it were, the core has the opposite lay, so it would unwind as the cover yarns got too darn tight. I really can't think of a good reason why the lay of the wire would matter here, even without considering that the sail could be wound up the other way.
This inevitably leads me to wonder what the sailmaker knows about rigging. Unless there's a factor that I'm missing -- and there may well be -- it sounds like you might want to do some independent research on the requirements of the furler. Start here if you like.
Fair leads,
Brion Toss

[Brian Duff]

There are small 'racing boat' furling units are used to rotate the wire that is the forestay while sailing. I dont like them , but they are widely in use.

Either way, I agree with Brion - the direction you twist the wire is mute.
I think this is because when twsiting you're unloading one half and loading the other half of the cable. Better hope there is a nice fat saftey factor for that kind of abuse!

call your rigger, he'd be happy to talk about this with you too.

[Stumble]

As a follow up and slightly better explanation....

The system is a Schaffer free flying system ( http://www.furling.com/freeflying.html) that is designed to furl the sail around a wire siezed inside the luff of the sail. After talking to Schaffer's tech department their feeling is that the lay of the wire should match the way that the drum spins so that as you pull the furrling line to roll in the sail the wire is tightened in it's lay.


Normally I wouldn't use this system since I feel it is significantly less sound than a design that uses a foil to turn the sail around, but like many tools this one has it's place. In this application the sail is being used to provide a short handed option to a racing sailboats normal tuff-luf system. So there will be always be the permanent headstay attached. Keeping the structual requirements of this sytem as low as possible.

[Brian Duff]

Schaefer is confused.

If that be the case, you are using the luff 'wire' to roll the sail, a tourque rope would be a MUCH better choice than a wire.

http://www.southernspars.com/souther...uildpage&p=361

If you 'tighten' the lay on one half the strands, you loosen the lay on the other half the strands. Build in a large safety factor and change the stay often....

On many race boats the system you are describing is used WITHOUT an additonal headstay. Whoa!