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BubbleheadMd 03-22-2012 06:21 PM

New sail Dacron characteristics
 
When one buys a new sail made of modern Dacron, would you expect the luff and foot to stretch a little bit over time?

How much stretch would you expect say, within the first 6-12 months of use?

Lake Superior Sailor 03-22-2012 07:50 PM

Re: New sail Dacron characteristics
 
Wish I knew, But; I've never got that close to a new sail! Let me know when you find out....Dale P.S. Must be nice!

GeorgeB 03-22-2012 08:03 PM

Re: New sail Dacron characteristics
 
Too many variables. The short answer (I think) is up to 4%, but look it up on Quantum’s or North’s website. The luff and foot stretching is annoying insomuch is you are constantly tightening halyard and outhaul. The insidious stretch over time and use (abuse) is in the leech which will then require recutting and sewing. If you are looking into a new Dacron sail – remember that all Dacron is not alike and you want a high modulus/high thread count for a given cloth weight. Good Dacron is getting closer to the arimids and polyesters in terms of stretch with the added benefit as it ages gracefully over time. You get what you pay for

chef2sail 03-22-2012 08:06 PM

Re: New sail Dacron characteristics
 
Our new Quantum Main had no perceptable stretch the first year we had it. Less than 1 inch on the outhaul.

Dave

BubbleheadMd 03-22-2012 08:52 PM

Re: New sail Dacron characteristics
 
Quote:

Originally Posted by chef2sail (Post 849376)
Our new Quantum Main had no perceptable stretch the first year we had it. Less than 1 inch on the outhaul.

Dave

Hm...I was thinking a good quality Dacron, but not Quantum's hottest stuff.

chef2sail 03-22-2012 09:05 PM

Re: New sail Dacron characteristics
 
Nnot the real expensive...Challenge cloth high mod 8.3

RichH 03-22-2012 09:05 PM

Re: New sail Dacron characteristics
 
Actually if the dacron luff or foot is boltroped, the sail's 'edge' dimensions will 'shrink' as the boltrope is subject becoming 'fatter' and 'shorter' with constant cyclical strain. That's why a dacron sail should have its boltrope adjusted or 'eased' after about 200 - 300 hours (about every season) of 'hard' sailing if the sail is 'cross cut', longer adjustment interval if 'radial' cut and high modulus and aligned material.

A loose footed sail if over-stressed repeatedly will/may increase by 0.5 to 1% along the foot ... but thats from a lot of overstressing with the outhaul. Where this 0.5 -1% stretch on an old dacron sail is noticeable with age is along the leech (a blown 'open' leech)

BubbleheadMd 03-22-2012 09:18 PM

Re: New sail Dacron characteristics
 
Let me re-phrase the question:

Would a brand-new, quality Dacron sail experience any "settling in" when placed under loads for the first few uses?

GeorgeB 03-22-2012 09:31 PM

Re: New sail Dacron characteristics
 
If you are thinking that the Dacron will stretch a bit during the breaking in period, then not so much afterwards, I’m afraid that this is not the case. It will stretch according to the load you place on it. That it is why it is always a good idea to loosen the outhaul on the main and halyard on the furling jib so not to make the stretch permanent. Remember that woven cloth has warp and weave directions and the sailmaker in using his panel cutting techniques will try and get the two to stretch at the same rate. The biggest sin you can do is motor while the main is up and fluttering. “Motor boating” is music to a sailmaker’s ears. If you are thinking about racing the sail, sail with it the fewest amount of times as you can (use the old sails to deliver the boat). All sails start stretching the day you fist use them and stop the day you throw them into the dumpster.

zz4gta 03-22-2012 09:45 PM

Re: New sail Dacron characteristics
 
Bubble, I'm not sure I like these questions.

Shoot some photos close hauled looking up to the mast head from the mid point of the foot. Like these
http://img528.imageshack.us/img528/2918/p5280935.jpg

http://img26.imageshack.us/img26/6606/p5280934.jpg


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