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kitesurfing lines shrink!!

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BillyGoatGruff
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kitesurfing lines shrink!!

Postby BillyGoatGruff » Tue Jun 26, 2018 8:32 pm

Well I never knew that!.. Dyneema kite lines get shorter over time.

Just bought some new 24m dyneema lines for my used 2014 Naish Torch bar, and some new naish 13m front flying lines. I offered up the 24m lines (not Naish) and they were around 18cm longer.... I put it down to a error in measuring when being made. Offered up the new 13m Naish lines and the new ones came up about 15cm longer..... right this can't be right surely old lines have stretched out and are longer than brand new lines :o

http://www.wetestkites.com/2016/10/14/s ... ite-lines/

Matteo V
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Re: kitesurfing lines shrink!!

Postby Matteo V » Tue Jun 26, 2018 8:37 pm

Front and back shrink at different rates due to loading.

There can be errors in how a lineset is put together. Some years the factory will cut at the finished length, then other years they may cut at a length that finishes off to the specification for finished length. Most years they have some consistency to their construction methods.

Just make sure your front's are proportional to your back lines. Mixing old and new lines is very much a hazard to your health, unless you measure.

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jakemoore
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Re: kitesurfing lines shrink!!

Postby jakemoore » Tue Jun 26, 2018 8:45 pm

You might imagine that from a thermodynamic standpoint that heat assisted prestretch of the UHMWPE braid and fiber decreases the entropy in the line.

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BillyGoatGruff
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Re: kitesurfing lines shrink!!

Postby BillyGoatGruff » Tue Jun 26, 2018 8:47 pm


iriejohn
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Re: kitesurfing lines shrink!!

Postby iriejohn » Tue Jun 26, 2018 9:29 pm

Regularly re-calibrate your lines and whenever they are replaced. Always replace in pairs. Wet them and give them a good pull before re-calibrating. Make sure that the centre lines are the same length before checking the outside (steering) lines.

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Re: kitesurfing lines shrink!!

Postby plummet » Wed Jun 27, 2018 11:39 am

Yep. It's counter intuitive bit true.

Matteo V
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Re: kitesurfing lines shrink!!

Postby Matteo V » Wed Jun 27, 2018 6:05 pm

jakemoore wrote:
Tue Jun 26, 2018 8:45 pm
You might imagine that from a thermodynamic standpoint that heat assisted prestretch of the UHMWPE braid and fiber decreases the entropy in the line.
Some of that word salad looks good!

I do like to stretch lines at a temp of 18°C (65°F) to 32°C (90°F). Lower temps are ok if you only use the line in low temps. But if you take a line stretched (with my method) in low temps and utilize it at high temps, they seem to go out of tune more frequently.


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