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Mainsail luff shrinkage---acceptable? |
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brys
Groupie Joined: 16 Mar 04 Location: United Kingdom Online Status: Offline Posts: 89 |
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Topic: Mainsail luff shrinkage---acceptable? Posted: 06 Mar 07 at 8:58pm |
The following text taken from the Laser SB3 web site..... Can anyone explain why this happens and why is it accepatble that it happens in 2007, when we are bombarded with sailmakers claims about shape retention, dimensionally stable sailcloths and all the other puff we read when deciding who should get our hard earned cash for new sails?
"If you lay a new main on top of an old main, you will see the luff is 6-10 inches longer on a new one, than an old one. This is because after about a year, the bolt rope in the luff shrinks, and they all end up roughly the same."
QED if anyone sails with anything other than a brand new sail at any major competitions they are at a distinct handicap!
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Never enough time for sailing
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Guest
Newbie Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
Post Options Quote Reply Posted: 06 Mar 07 at 9:42pm |
All hi tec sails do that - I don't think it's luff rope shrinkage but the creases that use causes. If you screw up a bit of paper then straignten it out it's not as big as the creases consume material. It's nothing to do with sail quality - it's just what happens when flat meterials get creased. |
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HannahJ
Really should get out more Joined: 23 Jul 05 Location: United Kingdom Online Status: Offline Posts: 861 |
Post Options Quote Reply Posted: 06 Mar 07 at 9:52pm |
From a mirror point of view, which i presume applies to others, this is bad news as it makes the sail a funny shape. Most sailmakers can either replace the rope with a longer one, or add on a bit to bring it to length.
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MIRROR 64799 "Dolphin"
The pessimist complains about the wind; the optimist hopes it will change; the realist adjusts the sail |
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Lukepiewalker
Really should get out more Joined: 24 May 06 Location: United Kingdom Online Status: Offline Posts: 1340 |
Post Options Quote Reply Posted: 06 Mar 07 at 10:03pm |
Often it can be sorted by simply unstitching the boltrope at the bottom end. You'll see a lot of classes where the sails are supplied with an extra bit of bolt rope sticking out the end for this purpose.
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dics
Far too distracted from work Joined: 05 Oct 05 Online Status: Offline Posts: 317 |
Post Options Quote Reply Posted: 07 Mar 07 at 1:09pm |
Known issue in the 300 class. Our class rules allow you to fix the sail to the boom withoout using a shakle. So you can then use a bit of odd string instead to reliease the tension. This stops too much luff tension. In some cases the sails have strank so much tenstion is the same as cranking on the cunningham! See Mr Baille's "Jock Strap" http://www.rs300.com/Features/ian_baillie_tells_us_how_he_ha s_.htm |
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Rob.e
Really should get out more Joined: 19 Oct 04 Location: United Kingdom Online Status: Offline Posts: 545 |
Post Options Quote Reply Posted: 07 Mar 07 at 4:18pm |
Mr Baillie being a Scottish person, for those who don't know
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timnoyce
Really should get out more Joined: 05 Aug 04 Location: Hampshire Online Status: Offline Posts: 1991 |
Post Options Quote Reply Posted: 07 Mar 07 at 5:41pm |
Mr Pie Walker is right. If your bolt rope has a long tail at the end then simply un stitch it, pull it tight, and then stitch it back again. If you ever get a bolt rope replaced then remember to ask for a tail!
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BEARFOOT DESIGN
Cherub 2648 - Comfortably Numb |
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Lukepiewalker
Really should get out more Joined: 24 May 06 Location: United Kingdom Online Status: Offline Posts: 1340 |
Post Options Quote Reply Posted: 07 Mar 07 at 7:23pm |
Or buy a Finn.... We just have elastic bolt ropes....
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Charlie
Far too distracted from work Joined: 08 May 06 Location: United Kingdom Online Status: Offline Posts: 209 |
Post Options Quote Reply Posted: 07 Mar 07 at 10:06pm |
Yup and pisses me off every time i hoist the sail, but at least the rig tension is kept. |
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Finn GBR 657 - Blown It
Laser 164635 Planet Earth: 30% Land, 70% race course! |
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Matt Jackson
Really should get out more Joined: 21 Sep 04 Location: Darlington Online Status: Offline Posts: 962 |
Post Options Quote Reply Posted: 08 Mar 07 at 12:57pm |
Doesn't every class? |
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Laser 203001, Harrier (H+) 36
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