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foil kite flying line strength

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ariel_cloud
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Local Beach: Qidong in China
Favorite Beaches: Pingtan in China, Tarifa in Spain, Kalpitiya in Srilanka.
Style: freeride, hydrofoil and racing.
Gear: Flysurfer Sonic FR18m, Speed21m, KFA MK3.
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foil kite flying line strength

Postby ariel_cloud » Mon Nov 19, 2018 9:01 am

Hi there,
Wanna buy some Liros DC Pro SK99 as flying lines, we can chop whatever meter we want then tie up. What strength of the flying lines you guys are looking for? Should take a balance with the drag by the diameter of the lines.
Below are some figures for the breaking load:
Thanks guys.
Ariel
Attachments
Picture1.jpg

nixmatters
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Local Beach: Dutch coast, Greek and Canary Islands
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Re: foil kite flying line strength

Postby nixmatters » Mon Nov 19, 2018 2:39 pm

ariel_cloud wrote:
Mon Nov 19, 2018 9:01 am
Hi there,
Wanna buy some Liros DC Pro SK99 as flying lines, we can chop whatever meter we want then tie up. What strength of the flying lines you guys are looking for? Should take a balance with the drag by the diameter of the lines.
Below are some figures for the breaking load:
Thanks guys.
Ariel
Hey Ariel, almost 3 times stronger for same diameter?!?! (2.8 to be precise)
Please double check the numbers with your and other sources and update your post. Above information is totally wrong and misleading!

1st hint: SK99 is just 10-25% 'stronger' than SK75/78
Attachments
SK99 vs SK75.JPG

CaptainB
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Posts: 16
Joined: Tue Dec 31, 2013 7:41 am
Kiting since: 2008
Local Beach: Jersey Beaches
Gear: Cabrinha and Core Kites, Cabrinha ace kiteboard, LF Foil Board, Mystic majestic harness.
Brand Affiliation: Green Hat Kiteboarding

Re: foil kite flying line strength

Postby CaptainB » Mon Nov 19, 2018 6:44 pm

We pulled our numbers right from the manufactures website. The SK99 is much stronger than sk 75 see images attached:

The SK99 1.1 is about 40% stronger than the sk75 1.1

We have been using this line for a couple year and it strong and pretty easy to splice!
https://greenhatkiteboarding.com/liros- ... -per-meter
Attachments
Screen Shot 2018-11-19 at 12.36.59 PM.jpg
Screen Shot 2018-11-19 at 12.36.45 PM.jpg

ariel_cloud
Rare Poster
Posts: 17
Joined: Thu Apr 20, 2017 8:28 am
Kiting since: 2016
Local Beach: Qidong in China
Favorite Beaches: Pingtan in China, Tarifa in Spain, Kalpitiya in Srilanka.
Style: freeride, hydrofoil and racing.
Gear: Flysurfer Sonic FR18m, Speed21m, KFA MK3.
Brand Affiliation: None

Re: foil kite flying line strength

Postby ariel_cloud » Tue Nov 20, 2018 7:29 am

nixmatters wrote:
Mon Nov 19, 2018 2:39 pm
ariel_cloud wrote:
Mon Nov 19, 2018 9:01 am
Hi there,
Wanna buy some Liros DC Pro SK99 as flying lines, we can chop whatever meter we want then tie up. What strength of the flying lines you guys are looking for? Should take a balance with the drag by the diameter of the lines.
Below are some figures for the breaking load:
Thanks guys.
Ariel
Hey Ariel, almost 3 times stronger for same diameter?!?! (2.8 to be precise)
Please double check the numbers with your and other sources and update your post. Above information is totally wrong and misleading!

1st hint: SK99 is just 10-25% 'stronger' than SK75/78
Hello,
Thanks mate, so which one do you suggest? or what strength do you think is enough for flying foil kite with foil board?
Ariel

ariel_cloud
Rare Poster
Posts: 17
Joined: Thu Apr 20, 2017 8:28 am
Kiting since: 2016
Local Beach: Qidong in China
Favorite Beaches: Pingtan in China, Tarifa in Spain, Kalpitiya in Srilanka.
Style: freeride, hydrofoil and racing.
Gear: Flysurfer Sonic FR18m, Speed21m, KFA MK3.
Brand Affiliation: None

Re: foil kite flying line strength

Postby ariel_cloud » Tue Nov 20, 2018 7:31 am

CaptainB wrote:
Mon Nov 19, 2018 6:44 pm
We pulled our numbers right from the manufactures website. The SK99 is much stronger than sk 75 see images attached:

The SK99 1.1 is about 40% stronger than the sk75 1.1

We have been using this line for a couple year and it strong and pretty easy to splice!
https://greenhatkiteboarding.com/liros- ... -per-meter
Hi Captain,
which diameter do you suggest for flying foil kite with foil board?
Thank you.
Ariel

joriws
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Re: foil kite flying line strength

Postby joriws » Tue Nov 20, 2018 8:17 am

Quickly looking at Flysurfer (using Liros)

Infinity 3 airstyle-bar (seems to be SK75):
Low Drag Flying Lines

The low-drag flying lines (length: 21m) have an impressively-low air resistance (diameter: 1,80 mm Front / Back 1,60 mm) and a very high breaking load (300kg Front / Back 200kg).
Infinity 3 race-bar (sounding DC PRO SK99 although front lines not directly on Ariel's table
12m - 15m - 17m Low Drag Race Flying Lines

For the Race flying lines, we have worked to find an optimal balance between diameter reduction and breaking load (front 1.45mm / 300kg – Back 0.8mm / 160kg).

CaptainB
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Posts: 16
Joined: Tue Dec 31, 2013 7:41 am
Kiting since: 2008
Local Beach: Jersey Beaches
Gear: Cabrinha and Core Kites, Cabrinha ace kiteboard, LF Foil Board, Mystic majestic harness.
Brand Affiliation: Green Hat Kiteboarding

Re: foil kite flying line strength

Postby CaptainB » Tue Nov 20, 2018 3:26 pm

ariel_cloud wrote:
Tue Nov 20, 2018 7:31 am
CaptainB wrote:
Mon Nov 19, 2018 6:44 pm
We pulled our numbers right from the manufactures website. The SK99 is much stronger than sk 75 see images attached:

The SK99 1.1 is about 40% stronger than the sk75 1.1

We have been using this line for a couple year and it strong and pretty easy to splice!
https://greenhatkiteboarding.com/liros- ... -per-meter
Hi Captain,
which diameter do you suggest for flying foil kite with foil board?
Thank you.
Ariel
Most people including myself use 1.5mm for center lines and 1.1 for outside lines. This is stronger probably than most stock kite lines with a lot less wind resistance than thicker lines. We just picked up .83mm as we do some racing and many guys have been using that for their outside lines (again to reduce drag from wind resistance). I don't recommend using .83 for center lines and even the 1.1 could be a bit sketchy on center lines after they wear a bit.

If your looking for kite line that won't need to be replaced for a very long time we also have 1.6.

You can also just go with 1.5 on center and outside lines, but outside lines have very little amount of tension on them and don't really need to be as strong.

nixmatters
Medium Poster
Posts: 56
Joined: Sun Jun 12, 2016 12:38 pm
Kiting since: 2009
Local Beach: Dutch coast, Greek and Canary Islands
Style: explosive
Gear: Cab, Slingshot, CF
Brand Affiliation: None

Re: foil kite flying line strength

Postby nixmatters » Thu Nov 22, 2018 12:24 pm

Hi Ariel & Captain,

These Ø mm/daN values shown is LIROS website just don't make sense. Sorry if I sounded a bit harsh above :)
Upto 40% higher breaking strength of SK99 lines vs SK75 lines is realistic, anything above is not. Even if we consider different coating thickness and braiding density/structure. If you have a direct contact with LIROS, ask them to send you the TDS.

For low drag front lines 1.5-1.6mm SK99 is probably the best option, 1.1-1.2mm SK99 for the steering lines. See below actual test data that comes from another European kite lines manufacturer.

Going thinner has few issues:
- SK99 comes only from DSM and in only one yarn count (880 filaments x 1dtex). This means that the final dtex (thickness) of the braided line is limited to 8x880, 12x880, 16x880. With SK75 there are few yarn options that can be used for kite lines. And there are other yarn suppliers of 'SK75 grade' apart from DSM.
- Abrasion resistance of SK99 vs SK75 is likely to be a bit lower (despite being a stronger) as the single filament of SK75 is ~50% thicker than SK99.
- IKA regulations on racing kite lines diameter are: min. 1.2mm front lines and min 0.8mm back lines. http://sailing.org/tools/documents/FK20 ... 24069].pdf
- Safety - a thin line can cause a much greater damage (cut) if wrapped around any body part.

Another point is the actual elongation (while riding) of the front and rear lines, having different thickness and different load. But I think in foiling this is insignificant and deserves no discussion. Especially with SK99.
Attachments
Liros DC_DC PRO.JPG
Liros DC_DC PRO.JPG (51.57 KiB) Viewed 307 times
1.65mm_SK99_16x880.JPG
1.1-1.2mm_SK99_12x880.JPG
IKA line thickness.JPG

ariel_cloud
Rare Poster
Posts: 17
Joined: Thu Apr 20, 2017 8:28 am
Kiting since: 2016
Local Beach: Qidong in China
Favorite Beaches: Pingtan in China, Tarifa in Spain, Kalpitiya in Srilanka.
Style: freeride, hydrofoil and racing.
Gear: Flysurfer Sonic FR18m, Speed21m, KFA MK3.
Brand Affiliation: None

Re: foil kite flying line strength

Postby ariel_cloud » Mon Nov 26, 2018 11:07 am

Thanks Captain and Nix,
You guys give very useful tips to us. Cheers.
Ariel


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