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Dyneema SK75-12 lines

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4wings
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Dyneema SK75-12 lines

Postby 4wings » Sun Apr 15, 2012 11:40 pm

I'm currently working on a kite-sailer ( see: http://www.kite-sailer.com ) and the kite control bar requires thinner lines - for initial testing we used sailing lines as I'm mostly boat-builder / sailor but they are just plain simple to bulky to make it work smooth.
Comparing the tensile strength of different products - dyneema SK75-12 lines have the best diameter to breaking strength numbers ...
Avg. Tensile strength for 1.8 mm - 1000 lbs
Avg. Tensile strength for 2mm - 920 lbs
Avg. Tensile strength for 3mm - 1920 lbs
With a price of average 0.45 per linear foot.
Available kite lines have Dyneema fibers as well - just not sure if 65 or 75 - their description is :
"PKS High-Visibility Pro-Lines line sets are high quality Dyneema lines specifically designed for kite-boarding, with a 700 lbs test strength .... at 0.54 per linear foot"
The kite lines I bought recently have 1.6 to 1.8mm cross section - the sailing lines are treated against UV and are often used for lifelines or running rigging where they are exposed to UV on a 24/7 basis ...so just wonder what might be the difference on the Dyneema SK75-12 to the kite lines?
Other aspect of interest is with a increase of 1.2mm line diameter - you could increase the breaking strength by more than 100% - and have a better overall line ---
Is the small diameter so important? Or am I missing something?
Michael

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Re: Dyneema SK75-12 lines

Postby BWD » Sun Apr 15, 2012 11:56 pm

for a kite 3mm seems huge, but it depends on the size of the kite i guess....

4wings
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Re: Dyneema SK75-12 lines

Postby 4wings » Mon Apr 16, 2012 12:19 am

BWD wrote:for a kite 3mm seems huge, but it depends on the size of the kite i guess....

3mm is equal to 1/8" and the lines I just bought are 1.8mm ( just a bit more than 1/16 ) - so we just increase by 1.2mm ( 1/64")?
What are the disadvantages of this increase ?

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Re: Dyneema SK75-12 lines

Postby BWD » Mon Apr 16, 2012 2:28 am

drag, weight, cost, pain in the ass.
But, if you need the strength, you need the strength....
Depends on the kite, the load on it, and how it's controlled....

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Re: Dyneema SK75-12 lines

Postby Kamikuza » Mon Apr 16, 2012 4:21 am

If you can, have a look at Liros lines... IIRC they're thin for their load limits relative to dyneema etc.

4wings
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Re: Dyneema SK75-12 lines

Postby 4wings » Mon Apr 16, 2012 2:13 pm

Kamikuza wrote:If you can, have a look at Liros lines... IIRC they're thin for their load limits relative to dyneema etc.

Thanks Kamikuza - will look into it
Michael

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Re: Dyneema SK75-12 lines

Postby JMF » Mon Apr 16, 2012 4:12 pm

Some usefull info for you maybe it will suit your application. Have not been able to find Vectran under 3mm though, HMA have not checked.

http://www.performancedesigns.com/hma.asp




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Re: Dyneema SK75-12 lines

Postby edt » Mon Apr 16, 2012 5:37 pm

4wings wrote:so just wonder what might be the difference on the Dyneema SK75-12 to the kite lines?


The best kite lines are in fact dyneema sk75, though some kite line manufacturers use spectra, call the manufacturer just to be sure.

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Re: Dyneema SK75-12 lines

Postby 4wings » Tue Apr 17, 2012 1:49 am

JMF wrote:Some usefull info for you maybe it will suit your application. Have not been able to find Vectran under 3mm though, HMA have not checked.

http://www.performancedesigns.com/hma.asp





@JMF thanks for the info - appears as Vectran and Dyneema have the same breaking strength ... need to research a bit deeper to find other pro or cons for one or the other one - but thanks for the info -
Michael

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Re: Dyneema SK75-12 lines

Postby 4wings » Tue Apr 17, 2012 1:56 am

edt wrote:
4wings wrote:so just wonder what might be the difference on the Dyneema SK75-12 to the kite lines?


The best kite lines are in fact dyneema sk75, though some kite line manufacturers use spectra, call the manufacturer just to be sure.

@edt - Just working on the best solution for the lines at the handle bar - as such not a manufacturer question - more best product for the application - thanks for the help.
Michael


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