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Medway Maniac View Drop Down
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Posts: 2788 		Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Topic: Vectran forestays
    Posted: 20 Aug 07 at 1:24pm

So it is possible. Still big question marks over damage (cutting) of standing rigging in my mind. Guytoon mentions trailing - hadn't thought of that one, but then, a wire thimble doesn't take kindly to a scrape up the M1 , we've found.

Aside: I always thought the loads on the shrouds were higher than on the forestay, so if 3mm sufficed for the shrouds I'd try less on the forestay.

Actually, I've been using 2.5mm V12 (Vectran) 2:1'd on my 3000 jib halyard for a season no probs. Haven't noticed the tension going off over time, but maybe after all this talk I should measure before and after racing?! (But how will I know if it's the rigging or the hull creeping?)
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guytoon View Drop Down
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Posts: 82 		Post Options Post Options   Quote guytoon Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 07 at 12:52pm

Just let you know that I've used vectran on my first i14 :

4 mm for the forestay

3 mm shrouds and caps

4 mm lowers

My Cherub has know the same. It has been a hassle to get them strech but after a few time its fine know.

Advantages : far easier to change by yourself, cheeper than cable, ligher

Disadvantages : strech at the beginning and presumly all its life but slower, not obvious to check, can be damage by flapping on the road.
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Roy Race View Drop Down
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Posts: 275 		Post Options Post Options   Quote Roy Race Quote  Post ReplyReply Direct Link To This Post Posted: 18 Aug 07 at 1:07pm

Originally posted by BBSCFaithfull

What is PBO for those less informed?

Polybenzoxazole. A really strong, low stretch, low creep, lightweight fibre.

It's woeful at sharp turns and sunlight though.

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Skiffybob View Drop Down
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Posts: 842 		Post Options Post Options   Quote Skiffybob Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 07 at 9:00pm

It's a synthetic cable that is covered with a pvc sheath to protect it. Very light, very strong, and virtually no stretch or creep. I think the numbers I've been quoted are something like 1/5th the weight of wire with about 2 or 3 times the strength.

The only problem with it on dinghys at the moment is the terminators, which are quite beefy stainless "compression joint" things. Vary cool stuff though.

http://www.oceanyachtsystems.co.uk/PBO.html

 
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BBSCFaithfull View Drop Down
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Posts: 1251 		Post Options Post Options   Quote BBSCFaithfull Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 07 at 6:17pm
What is PBO for those less informed?
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Skiffybob View Drop Down
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Posts: 842 		Post Options Post Options   Quote Skiffybob Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 07 at 7:30pm

Stick to wire, or PBO if you have the funds to burn.

Keep the V212/D12 for high-load running rigging. works great for kickers, downhauls, trapeze wires, etc.
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 07 at 5:46pm
Originally posted by NickA

UV isn't a problem if it's inside the jib luff -though I guess I'd better worry about the halyard which is out there on the mast rain and shinem (50% strength loss over 3 years apparently... and it would be nasty if it snapped!

the solution there is to attach an old bit of 3 strand to the end of your jib halyard when the boat is ashore then pull the halyard up. now all your nice expensive string is hidden inside mast/under cover so UV isnt a problem. you can get your halyard back when you want to sail by pulling on old bit of 3 strand. obviously you wouldnt leave the old bit of string on when you were sailing as it would add too much weight and windage.



Edited by mike ellis
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swiftsolo.org View Drop Down
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Posts: 101 		Post Options Post Options   Quote swiftsolo.org Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 07 at 11:26pm

Synthetics have been tried and discarded on Swift Solos for the main stays. The creep makes it really hard to duplicate rig tension settings. It is still being used on the cap shrouds as the creep issue is much less critical here and there are weight savings.

The guys in the Tris that are using synthetics have started using Dynex Dux. Limited creep, good uv resistance, easy to splice, good abrasion resistance and inexpensive. They are using it on rotating rigs which don't have a problem with creep as they run with slack rigging anyway to allow mast rotation. The rope can be obtained here http://www.precourt.ca/ 

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aardvark_issues View Drop Down
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Posts: 505 		Post Options Post Options   Quote aardvark_issues Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 07 at 3:34pm
I had vectran rigging on my moth before last. stretched like crazy, and even at 4mm I managed to snap one of the shrouds... Wire is the way, or PBO as Stan says.
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BigFatStan View Drop Down
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Posts: 78 		Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 15 Aug 07 at 3:17pm
Also I should say that I had a set of PBO shrouds on my Osprey this year - staggeringly light and very funky! Talk to Allspars if you are interested
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