cut of your jib
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=10346
Printed Date: 18 Jul 25 at 1:54am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: cut of your jib
Posted By: sawman
Subject: cut of your jib
Date Posted: 05 Jan 13 at 4:53pm
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Its long time since I last bought sails, but I notice that there is quite a large proportion of makers cutting radial sails, in line with the more widespread use of laminate cloths. Is there any advantage/disadvantage in laminate radial cut jibs versus dacron cross cut jibs for small boats. The miracle I have at the moment only has quite a small area and I am thinking that a dacron crosscut jib might be better option, due to its inherent overall ruggedness. The radial designs I have seen do look snappy though....
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Replies:
Posted By: SoggyBadger
Date Posted: 05 Jan 13 at 5:18pm
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Dacron outlasts laminates by quite a way on jibs. Miracle class rules don't allow laminates sails anyway. ------------- Best wishes from deep in the woods SB |
Posted By: sawman
Date Posted: 05 Jan 13 at 5:35pm
| Ah you are right, I was thinking of the polyant type of cloth versus the more traditional dacron construction |
Posted By: Paramedic
Date Posted: 05 Jan 13 at 9:11pm
| Polyant - at least the stuff Iv'e seen - is very stiff, i think it'd be a bit hard to read. |
Posted By: SoggyBadger
Date Posted: 05 Jan 13 at 10:53pm
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"Polyant" - I assume you mean one of the myriad of cloths made by Dimension Polyant. They make absolutely top-notch cloths. My advise though is leave stuff like that to your sailmaker. Tell them what's most important to use (e.g, performance, cost or longevity) and leave details like cloth selection and panel layout to them. ------------- Best wishes from deep in the woods SB |
Posted By: Paramedic
Date Posted: 06 Jan 13 at 8:46am
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There is - or was - a woven coth called polyant it was popular in ents and albacores. The ent sails used to go a horrible dark blue after a few months. I've not seen a sail made of it for quite some time. If the OP is indeed referring to Dimension Polyant then they are indeed top notch cloths :)
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Posted By: sawman
Date Posted: 06 Jan 13 at 9:50am
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thanks for that. I have memories of polyant in ents in the late 80' which was pretty dreadful stuff - didnt seem to suit jibs at all. if the new stuff is not the same as this, I'm good...
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Posted By: Graham T
Date Posted: 06 Jan 13 at 11:27am
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I ended up with a Radial cut main and a cross cut jib when I last bought new Miracle sails from Tim Rush - he had a radial pattern for the jib but reckoned the stitching on such a small sail would not be good for the airflow over it. Seems to work for me. ------------- Osprey 55 "Tebutinnang" Osprey 1245 "Two Bob Bit" Miracle 1358 "Thumper" |
Posted By: Mrs G
Date Posted: 06 Jan 13 at 7:21pm
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Hi There
I am a crew in a miracle and I think you need to get out there on the circuit and get a good look at the different jibs available and the sailmakers that are around e.g. I know that over the past 10 years that I have been on the circuit I have only seen Tim Rush in a Miracle twice...
We used to have a cross cut jib but I feel the part radial cut that we now have is fantastic, it sets a lot better, is more readable and is made by the sailmaker that was recomended by the class measurer for the new jib sheeting rules. (The class measurer currently uses these sails as well and there were at least 4 in the top 10 at Nationals)
I would suggest you get yourself on the Miracle Forum and ask around with what people recomend for a Miracle from people who sail a miracle?
------------- Miralce 3692 when not busy being a mummy. |
Posted By: iGRF
Date Posted: 06 Jan 13 at 7:48pm
I was going to add to this there's a lad down our lake club, makes pretty damn quick Miracle sails under the brand Gibson sails, he posts on here sometimes, I'll bet he knows, not that if I were him I'd be broadcasting my sailmaking secrets to all and sundry online, but google Gibson Sails. He's the reason those bloody things go so stupidly fast for a boat with a handicap of 1194 or whatever it is, and I know they've changed something recently to do with the jib, I heard them all clustered round this clunky old munter of a boat that litters up the lake going into paroxysms of joy about a cleat moving half an inch or something - they're not all there Miracle Sailors.. 
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Posted By: JimC
Date Posted: 06 Jan 13 at 8:27pm
Jib settings can be amazingly sensitive. Fractions of an inch can have a big effect. |
Posted By: dynamicsails
Date Posted: 06 Jan 13 at 11:18pm
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Hello there hope this may help, probably a bit of woffle but hey when I design a sail I start with a designed shape then I produce panels over the mould kinda like when you plug a boat, then we choose a panel layout that flows over that shape thanks to our rather fancy software! when choosing radial layout over cross cut the weight of the fabric comes into play, lighter fabric is utilised when orientationing the panels inline with the loads expected in the sail to help maintain the design shape
for smaller sails like jibs, cross cut tends to produce a super smooth foil, radial helps hold the shape better over time and higher loads in the fourteen the radial panel jibs do tend to out perform cross cut in the higher wind range, but the loads are pretty high, somthing like the miracle I might prefer cross cut to smooth the shape through luff to leech I treat every class of boat differently using the optimum panel and fabric option to suit the sailors requirements ps when you say polyant you might be refering to polykote which is a finish added to the fabric to stiffen the finish or harden creating a more stable cloth dave ds sails |