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Post by so40gtb on Oct 25, 2009 23:23:29 GMT
Does the SO34.2 have a turnbuckle in the forestay? I can't tell without dismantling the Profurl furler (has anyone done that?).
I'm out of backstay turnbuckle range and, though my calculations based on backstay tensions and appropriate vector analysis suggest that the forestay tension is reasonable, it seems not as tight as it ought to be under sail.
Obviously, if I can tighten the forestay a bit, the backstay turnbuckles will get back in range and I will be able to better optimize rig tensions.
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Post by MartyB on Oct 26, 2009 1:37:23 GMT
Karl, If you do not have a tensioner, as I do not, I was able to move the forestay down some, ie pull the mast forward by moving the pin that holds the forestay on the bow. You can see the attachment I have to a degree at the bottom of attached picture  I was able to do this by using my spin halyard, loosing the back stay and and side shroud. Undo the pin and move it closer to the deck. Gave me some more back stay adjust ment ability, along with less weather helm to a degree. The other issue you may have, is you SS wire has stretched, and it is time for a new for and back stay. Or at least a back stay. Good luck Marty |
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Post by renegade27 on Oct 29, 2009 23:22:24 GMT
MY SO35 doesn't have a turnbuckle for the forestay. Hard to believe! Saved the builder maybe $30 - but if I want to pull the top of the mast forward to reduce helm I've got to hire a rigger and take the mast down!
Penny wise...
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Post by electricmonk on Nov 4, 2009 16:17:19 GMT
Lots could be "wrong" but also lots could not be wrong.
The forestay is a fixed length, the tension is applied by tuning the rig and prebending the mast, this is achieved by adjusting the upper and lower shrouds NOT THE BACKSTAY - the backstay is a bit of a passenger until the mast is "set" - then its tensioned.
Yes the rig could have stretched and if this is the case it needs to be renewed rather than stretched some more.
I would start by trying to set the rig prebend correctly, back everything off and set it up again - use a rigger that knows Jeanneau - he will soon tell you if you need new wires.
I was sceptical about the fixed length forestay until I had my rig tuned - worth every penny.
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Post by crazytrain on Nov 24, 2009 9:02:59 GMT
I also have a forestay that is very loose. I've had my rig professionally tuned and even changed the backstay to be adjustable so as to tighten up in a blow, but it still isn't tight enough.
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Post by offshore on Nov 25, 2009 0:37:17 GMT
The 1 x 19 wire Jeanneau uses for the forestay does get some permanent stretch. I had a rigger check my forestay length and he cut nearly 2 inches off it. This allowed the rig to be set up much better. The rigger also suggested we use a lot more backstay than we had been using to flatten out he middle of the main.
Barry
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Post by so40gtb on Feb 14, 2010 3:39:28 GMT
The rigger at the local yard that sells Jeanneau declared my rig tuned "correctly" when it was loosey-goosey and causing 1 mph difference on opposite tacks! So I don't trust them to get it anywhere close to optimal and embarked on this DIY quest.
I can reduce pre-bend with the shrouds, but that will reduce lateral stiffness and, in turn, facilitate excessive mast bend under tacking load. The latter is pretty close to optimal, right now, but the forestay seems a bit under-tensioned, according to experienced racers that have gone out with me. Perhaps the solution is to shorten the forestay before launch this year.
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Post by electricmonk on Feb 16, 2010 9:39:18 GMT
The rigger at the local yard that sells Jeanneau declared my rig tuned "correctly" when it was loosey-goosey and causing 1 mph difference on opposite tacks! So I don't trust them to get it anywhere close to optimal and embarked on this DIY quest. I can reduce pre-bend with the shrouds, but that will reduce lateral stiffness and, in turn, facilitate excessive mast bend under tacking load. The latter is pretty close to optimal, right now, but the forestay seems a bit under-tensioned, according to experienced racers that have gone out with me. Perhaps the solution is to shorten the forestay before launch this year. You really need to find a "proper" rigger, you can only test and tune a rig when its out on the water with the sails on it under load, looking at it on the pontoon is a guide only. |
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