What string is best for the pole downhaul on a modern twin pole system?
In terms of strenght, 2.5mm dyneema will be plenty, many classes actually elasticate the downhaul, its purpose is to try and persuade the pole from sky-ing, and little else, loads are generally less than 500N, which fits well within the 5000N typical breaking strain of 2.5mm dyneema The driving load is taken by the guy.
I'm not sure what the current string is, but it is tied to the plastic ring through whichg the guy runs. It came undone today, so I thought I would splice it on, which would mean the thickness of the splice running through the hole in the bottom of the carbon pole. Hence I think it needs to be thinner to run nicely.
I'd go for 3 or 4mm as it is easier to splice. However i do prefer to tie them on myself! I think the ones on my current boat are 2.5mm and while wooley and in need of replacement they have lasted thne winter
Pole downhauls (snodgers) are never elastic on a modern Merlin!!!
no, I know, I was just using the fact that many classes elasticate them to illusrate that the forces are typically low.
Loads are not particularly low, or rather they are on a run but not on a reach, a tight reach is where you need low stretch in the whole system and a good cleat or the ring is not held to the end of the pole, which then bends on the forestay, not good.
aye, thats true you are right there.