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Jib Furling Systems - an enquiry!

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fudheid View Drop Down
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Post Options Post Options   Quote fudheid Quote  Post ReplyReply Direct Link To This Post Topic: Jib Furling Systems - an enquiry!
    Posted: 06 Jul 12 at 6:59pm
Originally posted by kfz

The systems ive used Theres no real tension in the cloth, the drum is normally spring loaded and produces a little tension in the cloth but this must be nothing compared to to what happens to the sails during a normally day or even the flogging they get on the slip waiting the trailer sailor in front to clear.
 
Plenty of downsides of reefing systems which are well documented on the net but this is isnt really one them.
 
Kev


Trust me no matter what or how you furl a jib/genoa you are shortening its life its foot and leech will be tight on the wire or spar and regular furling of hard finished race dacron -like most wayfarer genoas - will make it hook.
 yes it is not as bad as flogging which is why you need to keep flogging to a minimum hoist just before you launch etc etc....
regular or prolonged use of a furler is  second to flogging for shorten the life of foresails- remember it is used for ease of handling over performance/longevity.
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Post Options Post Options   Quote gbrspratt Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jul 12 at 1:05pm
the trouble with furling a jib is that you a trying to put a nice purpose designed 3d shape around a straight wire. You basically crush the middle of the sail and stretch the outsides. Sailmakers now put luff flatteners on yacht sails which are designed to make the fore stay thicker where the shape of the sail is so when you roll the sail it physically draws the shape out of the sail. This means it rolls smoothly and can be sailed partially furled with minimal damage to designed shape and the sail sits better when fully furled.
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jul 12 at 12:05pm
Used to have an old 505 with a furler.
It was nice to be able to launch and recover without the jib in a blow.
The 505 had the bottom bit of the furler tucked away inside the deck, so you still had a deck-sweeping genoa.
The only downsides are the weight aloft in the form of a swivel, expense and you would not want to roll a brand new sail that tightly, much less a laminate one.
Also you can't have a forestay, it tangles.

But for the club sailor with a softer dacron jib, it  is worth considering IMHO.
Racing, we used to sometimes roll the jib on light runs, but only really light winds.
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Post Options Post Options   Quote kfz Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jul 12 at 11:42am
The systems ive used Theres no real tension in the cloth, the drum is normally spring loaded and produces a little tension in the cloth but this must be nothing compared to to what happens to the sails during a normally day or even the flogging they get on the slip waiting the trailer sailor in front to clear.
 
Plenty of downsides of reefing systems which are well documented on the net but this is isnt really one them.
 
Kev
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Post Options Post Options   Quote gbrspratt Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jul 12 at 10:35am
Originally posted by fudheid

when you furl you tend to keep some tension on the sheets to encourage a nice smooth furl this load is predominately on the leech and foot tapes - even if you loose the sheets once furled a genoa will still keep some of that load. Also sailcloth is so tightly woven that if you (furl (or fold) the sail in the same way every time you will give it 'memory' increasing the potential of a hooked leech.
That's not to say that occasional use will shag your sail, on the asymetrics when it was very light if a furler was fitted we would furl the jib to increase the pressure on the kite but then we were buying new jibs every 18months...... because the leech was getting hooked.
If the furler worked you would see more boats with them but the hard facts are is that they are a compromise easy handling over sail longevity - exactly the same on yachts.



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Post Options Post Options   Quote fudheid Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jul 12 at 5:46pm
when you furl you tend to keep some tension on the sheets to encourage a nice smooth furl this load is predominately on the leech and foot tapes - even if you loose the sheets once furled a genoa will still keep some of that load. Also sailcloth is so tightly woven that if you (furl (or fold) the sail in the same way every time you will give it 'memory' increasing the potential of a hooked leech.
That's not to say that occasional use will shag your sail, on the asymetrics when it was very light if a furler was fitted we would furl the jib to increase the pressure on the kite but then we were buying new jibs every 18months...... because the leech was getting hooked.
If the furler worked you would see more boats with them but the hard facts are is that they are a compromise easy handling over sail longevity - exactly the same on yachts.
Cheers you

only me from over the sea......
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Post Options Post Options   Quote ColPrice2002 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 12 at 12:22pm
Hui,
 
Could you please explain how furling a jib stretches the leech?
 
I can understand that if it's reefed (i.e. part rolled then used) - but when it's furled, the tension is all on the luff wire (as normal) and there's no load from the sheets at all.
 
Colin
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Post Options Post Options   Quote fudheid Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 12 at 8:32pm
Furling your jib will shorten its life. furling the jib will stretch the leech and cause hooking.
Leave your sails down until needed and hove to with the jib backed whilst you wait for your start - you don't need to reach around the start line, sure practise the first leg or part of it.
keep flogging and furling to a minimum to lengthen the life of your jibs, no one wants to replace them so look after them. Smile
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Post Options Post Options   Quote ColPrice2002 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jul 12 at 12:36pm
Hi,
 
The Aero system is roller reefing - that is - you can reduce the foresail size and still use the foresail.
 
Most Wayfarers (and Wanderers) are fitte with roller furling for the jib (roll up completely).
 
If you're racing, then you won't want either of these - extra weight!
(until it's blowing F6+)
 
Approaching a start line does require a good spatial awareness of where all the other startes are, and where they are likely to be. You'll also need to know who has right of way etc at an instant.
 
I don't know how you were taught to handle gusts - I've heard a couple of methods, but for starting you need to position the boat just where you want it, and at the speed you want (typically full speed as you cross the line).
 
If the gust was making you less controlled, then dump the power by releasing the sheets - that's better than trying to head-up/bear away etc...
The Racing rules are about changing course - or not changeing course if you have right of way) - but the speed may be varied...
 
Colin
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Post Options Post Options   Quote kfz Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 12 at 8:28am
Isnt that aero system reefing rather than furling?   what do you want?
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