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Forestay and jib luff tension

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mike pearce View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mike pearce Quote  Post ReplyReply Direct Link To This Post Topic: Forestay and jib luff tension
    Posted: 06 July 2018 at 10:27
Hi
I would be interested to hear from others on this topic.
When beating in strong winds the forestay sags off with the resultant loss to tension on the self tacker luff. Crinkles appear in the middle of the luff spoiling itís shape as the centre of effort moves back even though I have applied maximum halyard tension before setting the sail (which is new this season.)
I have tightened the cap shrouds such that it is difficlt to apply further tension using a reasonably sized screw driver to tighten the bottle screws.The inner shrouds are less tensioned. I apply good tension to the backstay.
I appreciate this is a common issue with fractional rigs but do I need to apply further tension to the caps?
I am still using the original polyester halyard on the jib. Would dynema solve the issue re luff tension ? I am mindful that if the forestay still says then luff tension will be lost irrrespective of the type of halyard I use.
Have others any tips or suggestions ?
Thanks
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Konstantin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Konstantin Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2018 at 12:22
We had similar issue on our 445 until we tensioned the rig using "Selden hints and advice" manual from Selden web-site. It took some 40cm long wrench and two strong man to tighten cap shrouds to 20% breaking load. We now have aprox 10cm mast pre-bend and the whole set-up behaves completely different in strong wind, virtually no sagging, totally no shaking or loose components. So I would recommend checking with "Selden hints and advice" manual for tensioning procedure. I had to re-read their statement twice that "it is very unlikely you can ever overtension the rig with common hand-tools" before I dared to proceed from 15% breaking to 20% because I thought it couldn't be more tight already!
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Carlosailfan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Carlosailfan Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2018 at 12:51
Similar issue on our 385, so I will tension also to 20% of breaking load, the only issue where I am afraid is the fixation of the standing rig at both sides on the hull. On some production boats you see the rig is internally connected ( visible to lower parts in the yacht ) @ our Hanse it comes on the side of the hull and I cannot see how the structure is reinforced to take all the load. Must be Hanses are really strong build but I still fear a bit to rip the fixation off.

Maybe its only in my head and if someone can convince me would be great Wink
Best regards
/C
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Rubato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2018 at 18:49
Have a look at this document...
http://www.wesailhanse.se/370_documents/370_documents_northsails/northsails%20-%20MastSetup370.pdf

The polyester halyard will stretch like crazy so one with a dyneema core will be quite a bit better. As far as tensioning the cap shrouds, I found I had to use a bar about 40-45 cm long to get the leverage needed to turn the bottle screws for the cap shrouds - pulling on some backstay during the adjustment helps, make sure you take the back stay off for the tension measurement though.

Good luck
Steve

Hanse 400e, #168
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mike pearce View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mike pearce Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2018 at 07:09
Thanks for tips.
Sounds like more tension will be necessary and that I need to get a longer bar as my ď largeĒ screwdriver is only 30cms long
Iíll take a look at the Seldon & North manuals.
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2018 at 08:42
I dislike placing a bar between the tangs of the rigging screws as it places a diagonal load on them. I do not think that they are designed for this. Instead I use a large adjustable spanner on the outside across the flat sides where it seems to do less damage. I grip the other parts with good quality tight fitting spanners. Before any attempt at tensioning I ensure that the threads are well lubricated with thread lubricant as this reduces friction a lot.
My caps are tensioned to 25% & i use a gauge to check this


Edited by samuel - 08 July 2018 at 08:43
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Koppiekrou View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Koppiekrou Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2018 at 17:57
Donít forget to adjust the backstay. I did use the Loose gauge to measure the backstay. Unbelievable how much tension you can ad untill you reach 20% of the breakingstrenght. Now I have a nice prebend!

And you can adjust the capshrouds easy with so much tension on your backstay.

Have fun!
Hanse 292 - 4-ever, Hanse 341 - Eternal Flame, Elan 295 Koppiekrou, Eversson 33 - Quinto, Tartan 3500 Spirit of Joan, Bavaria 37 - Ziva, Hanse 371 Karma
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