Dyneema standing rigging on a cat

[jfranta]

Just saw this and have responded to The Prout owner from the Nov 25th email. Sorry about the delay, we are really swamped.

On the re-splicing below. If you use SK90 or 99, it has too much constructional elongation as it is already heat stretched at the fiber level and does not compact as well as SK75. This is why we always use heat stretched SK75 Dyneema. We make systems that act like steel in terms of elongation and can be used with 4.5" travel Turnbuckles. No Creep either. Standing rigging is very dependent on the type of Dyneema. And please do not use DM20 it has about 25% more elasticity than SK75 and will need to be sized much bigger for the same performance.

John Franta, Colligo Marine.

Originally Posted by fxykty

Sorry for confusing you. The lashings I suggested using were only for during the initial tensioning phase, when there are relatively large movements as the splices settle in. Lashings are needed only if you don’t have new turnbuckles with over-long threads that can be cut as the constructional stretch gets taken out.

Properly sized, the amount of creep movement is several turns of the barrel per year (so I’m told by local riggers who have built fibre rigs for well over a decade - we only have 6 months so far on the rig).

Same for stretch; there should be effectively no stretch at the relatively low level of static tension vs breaking strength of the dyneema.

Certainly not so much movement that the bottom splice has to be redone twice a year! How is that possible?

[out42]

I'm thinking I didn't use a thick enough fibre at 13mm listening to this thread, but on the other hand it all worked well. Redoing the splice is easy and takes about 20-30 mins per side if conditions are ideal (sun, light wind, beach and taverna nearby, beer, sunshade, etc). You also have the comfort of knowing you have done it right!