Going to be getting some new shrouds for a superspars carbon mast deck stepped wooden boat, whats the best to get and why? and what diameter? 1x19 or 1x7 dyform.
Cheers in anticipation of the forth coming lesson / advice!
Posted: 13/05/2010 21:39:14 By: Martin |
you can get away with 2.5mm dyform but you will need 3mm 1x19. In the past my choice has largely been influenced by what the chandler has in stock!! The terminals are cheaper for the 2.5mm, but the wire is slightly dearer. There is little performance differance, 1x19 will stretch more than dyform, but on a boat like a merlin with no cast iron setting for rig tension this is little problem.
Posted: 13/05/2010 22:32:55 By: Chris M |
Dyform is no longer manufactured in the same style as I was used too when I replaced BAU's shrouds before the dinghy show. The new stuff is not as smoothe on the outside. Of course you could always use some of the new high strength, low stretch Dyneemas. SK78 Maxx was Allspar's suggestion and it looks cool in black, splice the ends yourself ...
Posted: 14/05/2010 17:15:34 By: Andy Hay - Champs Chappie |
Be warned though no matter what they say dyneema or similar is pray to fraying if not fully wrapped up when towing and suseptable to UV if left up and exposed to light the time.
Posted: 14/05/2010 17:19:01 By: (:) |
I still cannot see any point in not using wire for the shrouds. I must weigh and price this up and see how much you spend per gram saved!!
The strops through the deck are differant though. Vectran is superior to 7x19, over the short length the cost differance is small and it doesn't fray at the ferrule.
Posted: 15/05/2010 08:22:08 By: Chris M |
The dyneema option saves weight and weight as Uffa Fox taught us is useful only to the designer of a steam-roller!
Posted: 15/05/2010 09:15:37 By: (:) |
Wouldn't you know it asked the question and one broke today!!!
Posted: 16/05/2010 19:39:47 By: Smokin |
Is vectran commonly used for the bit that goes through the deck?
How long does it last?
What size? A bigger size should be stronger, but do the splices have to be so long they meet in the middle?
Is it better to have naked vectran braid, so you can see if it frays, or sheath it with something to protect it?
I'm thinking of 4mm with long splices, so it will be 6 or 7mm thick going through the deck sheaves.
Any better ideas?
Thanks in advance!
Posted: 29/05/2011 19:12:48 By: Chris I |
