Top end race boat
are still using dyneema
, they have just switched to higher grades, really high end boats are using heat set sk-99 but that stuff gets insainly expensive very, very quickly and I would not recommend it to anyone that isn't sponsored, and racing
at the very top end of world fleet racing
While I generally agree with Uncivilized, no one has ever show actual creep in dyneema
halyards. At the loads halyards see the amount of expected creep for even the cheapest dyneema is on the order of .01% line length a year. What happens is that as the line is loaded the findividual fivers set into place, and this causes the line to 'grow' just a bit. This is called constructional stretch and will happen every time the line is unloaded then reloaded and is noticeable.
To work it out you have to tension the line hard every time, give it a few minutes for the fibers to align, then trim it. The amount of constructional stretch is line dependent, but about 12" for 50'.
Note that all single
braid lines do this regardless of material, so Kevlar, and vectran have the same issue. Dyneema is the worst in this regard because the individual fibers are so slippery the line moves the most.