GHA
Well-Known Member
I have a loop on a shroud which is used with a block and tackle to get water etc on board from the dinghy. Prussick knot with some seizing to keep it tight. Works fine even though it's slippy thin hi tech cord.
Attaching pulley to backstay
- Thread starter rajjes
- Start date
boguing
Well-Known Member
I used a rolling hitch for this purpose. It never moved. Wasn't too bothered about uv damage because I had a stretchy line to the plank, the idea was that it held it up a few inches to stop noise. When human mass was applied it rested on the ground, and a failure wouldn't matter.
Any hard device clamped to rig wire makes me uncomfortable. Yes, I know that salt and dust will build up inside a knot, but that is more or less trivial because all the rig wire has it to an extent anyway.
Any hard device clamped to rig wire makes me uncomfortable. Yes, I know that salt and dust will build up inside a knot, but that is more or less trivial because all the rig wire has it to an extent anyway.
Poignard
Well-Known Member
Why?
rob2
Well-Known Member
Did I not mention crevice corrosion and stress raising earlier? Anything that excludes oxygen can produce the first and anything that alters the uniform flexibility of the wire can cause the second.
Rob.
Rob.
Poignard
Well-Known Member
But each strand of a wire rope excludes oxygen from its neighbouring strands and, apart from keeping an eye on it and replacing it every once in a while, we don't worry about it. So why should a tiny clip be a problem? Especially when it gets regularly flushed out by the rain.
I have been using the backstay tensioning system I described earlier for 16 years and I replaced the backstays after the first ten years. There was not the slightest sign of any harm being done to the wire.
rajjes
Well-Known Member
Thanks to all again. Thinking about the options;'
Dividing the backstay to fit a custom stainless fitting seems to be a bit of overkill for what looks as a simple request.
Wire clamps would definitely work, but after a few years I would start having (probably unfounded) nagging doubts about weakening the backstay.
A rolling hitch with additional seizing to stop it sliding is looking to be the best option. Hopefully it will be up to it and the passarelle will not come crashing down! Unfortunately the pulley needs to be quite high up the backstay to function so not easily replaceable!
Duncan
Dividing the backstay to fit a custom stainless fitting seems to be a bit of overkill for what looks as a simple request.
Wire clamps would definitely work, but after a few years I would start having (probably unfounded) nagging doubts about weakening the backstay.
A rolling hitch with additional seizing to stop it sliding is looking to be the best option. Hopefully it will be up to it and the passarelle will not come crashing down! Unfortunately the pulley needs to be quite high up the backstay to function so not easily replaceable!
Duncan
Mrnotming
Well-Known Member
Sometimes we forget the usefulness of a good ladder on a boat to get at rolling hitches that have become marooned up the backstay!Now that I have thought of this I can get mine down a bit! It needs replacing as it has been up there for 7 years now, so as the OP says it should only be used now to keep the end if the plank from tapping off the quay, handy route for cockroaches and rats to get aboard too, if its not up a bit to discourage nasties!
claymore
Well-Known Member
Well, that appears to be that. My brilliant suggestion of a rolling hitch, plus the value added technical correctives in terms of prusiks appear tohave prevailed
Well done Claymore - great effort.
Well done Claymore - great effort.