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Re: Whats the preferred method to taper a mainsheet? [Re: ] #179374
05/22/09 09:37 AM
05/22/09 09:37 AM
Joined: Sep 2006
Posts: 586
Hobart, Tasmania, Oz.
Dazz Offline
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It's a liros magic pro sheet that comes with a spectra core. originally its only a 6mm rope but i removed the core and added another 4mm core inside the core. the extra core fattens up the sheet just nicely.

24x4mm = 96mm or 4 inches there abouts. but the splice has no structural value as the core runs the entire length of the sheet without joins and carries the load.

Pepin, your right about the taper, havnt finished this sheet yet, just happened to be making a new one tonight.


C2 AUS 222 by Goodall design
"Darph Bobo"
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Re: Whats the preferred method to taper a mainsheet? [Re: Dazz] #179382
05/22/09 10:38 AM
05/22/09 10:38 AM

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andrewscott
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so you have a 6mm outerbraid with a 4mm core ...

shouldn't it be 24x6mm? (144mm /5.7inches)

Re: Whats the preferred method to taper a mainsheet? [Re: ] #179383
05/22/09 10:40 AM
05/22/09 10:40 AM
Joined: Oct 2008
Posts: 126
Southampton UK
NacraKid Offline
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New wildcats have a 11:1 main sheet. Bit overkill i think, thinks it o just try and outdo the infusion, but 11:1 is too much on a f18, 10;1 is plenty. Bundy had cut his down to a 9;1

Re: Whats the preferred method to taper a mainsheet? [Re: NacraKid] #179405
05/22/09 03:26 PM
05/22/09 03:26 PM
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I think they put more purchase on the Wildcat mainsheet because it has a fatter head and shorter foot thus requiring more force to "close" the top.
Personally I think 9:1 is fine.

Re: Whats the preferred method to taper a mainsheet? [Re: Tony_F18] #179415
05/22/09 05:16 PM
05/22/09 05:16 PM
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claus Offline
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I like the first setup Tornado posted (maffioli swiftcord to dyneema), any chance to find instructions somewhere to do this???

Re: Whats the preferred method to taper a mainsheet? [Re: NacraKid] #179431
05/22/09 09:35 PM
05/22/09 09:35 PM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
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Originally Posted by NacraKid
New wildcats have a 11:1 main sheet. Bit overkill i think, thinks it o just try and outdo the infusion, but 11:1 is too much on a f18, 10;1 is plenty. Bundy had cut his down to a 9;1


I still like 8:1 - it takes a lot of muscle, but you can actually trim from the skipper position with an arm movement.


Jake Kohl
Re: Whats the preferred method to taper a mainsheet? [Re: Jake] #179433
05/22/09 09:46 PM
05/22/09 09:46 PM
Joined: Sep 2006
Posts: 586
Hobart, Tasmania, Oz.
Dazz Offline
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Dazz  Offline
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Andrew, the 6mm outer becomes a 4mm line without a core in it. have a 6 inch splice if you want, not going to hurt either way.

Jake, when you move onto a sail with 1 meter square top you need less travel to have the same effect. I agree 11:1 is too much, I find 10:1 is over the top sometimes.


C2 AUS 222 by Goodall design
"Darph Bobo"
Re: Whats the preferred method to taper a mainsheet? [Re: Jake] #179441
05/23/09 12:41 AM
05/23/09 12:41 AM
Joined: Nov 2002
Posts: 606
League City, TX
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League City, TX
Originally Posted by Jake
Originally Posted by NacraKid
New wildcats have a 11:1 main sheet. Bit overkill i think, thinks it o just try and outdo the infusion, but 11:1 is too much on a f18, 10;1 is plenty. Bundy had cut his down to a 9;1


I still like 8:1 - it takes a lot of muscle, but you can actually trim from the skipper position with an arm movement.


We use an 8:1 with the Harken 75mm block at the bottom. This seems to reduce the sheeting effort vs. the 57mm and you avoid the extra rope of the 9:1


Dave Ingram is my president. tcdyc rules
Re: Whats the preferred method to taper a mainsheet? [Re: ] #179442
05/23/09 01:07 AM
05/23/09 01:07 AM
Joined: Nov 2002
Posts: 606
League City, TX
flumpmaster Offline
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I use a double braid and bury the cover into the core in a taper splice. I don't weave the cover through the core - just a straight bury to keep things smooth. I lock stitch at intervals along the double braid and once in the buried cover section to keep things secure. I don't whip - this stiffens up the line and screws up how it runs through the blocks. I use 3/8 regatta trophy braid and replace the core with 1/4" spectra. I then splice in 3/16" spectra into the 1/4" with a taper splice.

Doing splicing on old sheets is a lot harder than starting out with brand new line. In fact sometimes if a sheet has been loaded up hard it is impossible (or certainly beyond my skill level) - so do yourself a favor and learn your taper splicing craft with some new line - just sacrifice a couple of feet for experiments.

Splicing robe line or maffioli swiftcord can be a little fiddly. One secret I found is to extract the strands you wish to trim for the taper starting at the end and working back towards where you want to cut. This is different than working with 12 strand single braid high modulus (e.g. spectra or vectran) where you can pull the strands out right where you want to make a cut. The 'fuzzier' robe line seems to snaggle up if you try and pull out a strand all at once.

Use the resources on the yale and samson websites for splicing instructions.

Main sheet size is a trade off - if a sheet is a little larger there will be more friction through the blocks - so it won't unsheet quite as fast and there will be more effort required to sheet in vs. a thiner line. On the other hand - a larger sheet can be more comfortable to pull on under high load. This can make it more likely that the sheet will be played in a puff rather than leaving it where it is and steering. The longer you are on the water the more this can matter - so skinny sheets might be a better choice for buoy racing vs. distance racing.

Chris.


Dave Ingram is my president. tcdyc rules
Re: Whats the preferred method to taper a mainsheet? [Re: Dazz] #179451
05/23/09 06:52 AM
05/23/09 06:52 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
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Originally Posted by Dazz
Andrew, the 6mm outer becomes a 4mm line without a core in it. have a 6 inch splice if you want, not going to hurt either way.

Jake, when you move onto a sail with 1 meter square top you need less travel to have the same effect. I agree 11:1 is too much, I find 10:1 is over the top sometimes.


I agree if you are sailing around a buoy course with refined upwind sailing. However, we often find ourselves (in distance racing) on a gonzo reach and the 10:1 is just too slow to get back in after a gonzo blast.


Jake Kohl
Re: Whats the preferred method to taper a mainsheet? [Re: Jake] #179674
05/26/09 09:28 AM
05/26/09 09:28 AM

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andrewscott
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andrewscott
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Thanks to all that helped with data

Re: Whats the preferred method to taper a mainsheet? [Re: flumpmaster] #179680
05/26/09 10:01 AM
05/26/09 10:01 AM
Joined: Jun 2001
Posts: 3,906
Clermont, FL, USA
David Ingram Offline
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I love my 10:1 and you'd have to pry it out of my cold dead hands before I go back to 8:1. Real skippers trim their own main :-)


David Ingram
F18 USA 242
http://www.solarwind.solar

"Do or do not. There is no try." - Yoda
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