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Mainsail luff shrinkage---acceptable?

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brys View Drop Down
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Post Options Post Options   Quote brys Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Quote Guest Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Quote HannahJ Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Quote dics Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Quote Rob.e Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 07 at 4:18pm
Mr Baillie being a Scottish person, for those who don't know
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Post Options Post Options   Quote timnoyce Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 07 at 7:23pm
Or buy a Finn.... We just have elastic bolt ropes....
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Post Options Post Options   Quote Charlie Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 07 at 10:06pm
Originally posted by Lukepiewalker

Or buy a Finn.... We just have elastic bolt ropes....


Yup and pisses me off every time i hoist the sail, but at least the rig tension is kept.
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Post Options Post Options   Quote Matt Jackson Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 07 at 12:57pm

Originally posted by Lukepiewalker

Or buy a Finn.... We just have elastic bolt ropes....

Doesn't every class?

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