Just purchased a new set of shrouds for 3321, and was wondering about spreader lenghts.
Posted: 27/07/2006 12:50:53
By: Hamish 3321
That seems counter-intuitive to me. Is the issue not the degree to which the shroud changes direction at the spreader tip, and therefore the extent to which the spreader transmits shroud tension to the mast? If you had no spreaders, the shroud would probably hardly bend the mast at all, irrespective of how much tension you put on it.
Posted: 27/07/2006 14:31:12
By: bill (3076)
See the articles in the library (GGGGG on setting up the mast) for a detailed overview on this. There's a point where you will push the middle of the mast to leeward if you lengthen the spreaders. You are looking to push the shroud out about 30-40mm from the straight line. As shroud bases differ so much from boat to boat there are no golden figures for offset and angle for older boats.
Posted: 28/07/2006 10:31:44
By: Andrew M
Here's one of the links.
Posted: 28/07/2006 10:44:22
GGGG's article is good for new, stiff boats. On an older, softer boat the 'out of line' may have to be significantly more,- depends on what you're trying to achieve.
Posted: 28/07/2006 12:02:37
By: Rod & Jo
I have printed GGGG's guide out and the others. Having come from Lasers into the merlins the only thing I know about seting mast's up is plugging the two bits together.
Posted: 28/07/2006 18:21:05
Does it not depend on sail cut, crew wieght etc. I think that tuning guides are great for one designs, but with things like the merlin you need to get the right guide for the right boat . Dick Batts guide is good for older merlins. Best thing to do hamish is try diferent settings.
Posted: 29/07/2006 19:38:48
Jib hooks directly into mast? Is that common?
Posted: 31/07/2006 08:59:55
It would apear to be rather unusual on merlins - certainly the only one i have seen. It means the rake is pretty much fixed - the only way to lenghten the forestay is to add shackles!
Posted: 04/08/2006 11:17:46
Pity you can't have the jib tension (and thus rake) adjustable from a purchase on the tack of the jib, led under the foredeck. But then of course the jib would rise off the deck as you raked.
Posted: 04/08/2006 13:30:46
Posted: 07/08/2006 11:52:58
Crewcut 684 and Beat Nik 1523 both had adjustable jib tacks but the fashion then was for a low cut jib a bit off the deck anyway and a bit of wood with holes in it served as adjustable job fairleads! Crecuts wasa fearsome affair with bike chains and levers Beat Nicks just wire rope and purchases, there were lots of others. But then things moved on.
Posted: 07/08/2006 12:27:02
By: Ancient Geek
Aha! The stuff luff....of course!
Posted: 07/08/2006 14:40:21
Mags I basically copies Lawries layout that he used on 'smart tart' on my NSM the photos youve posted are pretty clear, the only difference is that I used a couple of 15" harken mussle boxes which reduce the point loading & secondly were just sat in the shed!! It was more fun than decorating regards Barry.
Posted: 07/08/2006 20:52:28
By: Barry Watkin
Posted: 07/08/2006 21:20:10