Power Kite Forum
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: Broken Power Line
Glx


Avatar


Posts: 60
Registered: 2-28-2017
Location: Massachusetts
Member Is Offline

Mood: I need some more buggying!

[*] posted on 10-29-2017 at 05:27 PM
Broken Power Line


While buggying today i had one of the power lines get tangled on the front wheel. It got quite frayed at about 12" from the sleeve. After about another 15 min of riding it snapped off. In order to continue riding I used a blood knot and moved the other line up by about two inches and was able to continue flying for the rest of the day.
What do you suggest for a fix short of changing the whole line set. What kind of a knot would work out best? Or should I try to resleeve the line at the end. If yes, how do you do that?
Thanks
View user's profile View All Posts By User
B-Roc


Avatar


Posts: 2917
Registered: 3-9-2006
Location: Massachusetts
Member Is Offline


[*] posted on 10-29-2017 at 06:20 PM


Resleeve at the spot where the line broke and cut all other lines to the new length or leave the others the original length and add a longer leader to the broken line to compensate. DO NOT tie the broken line back together.



Depower Quiver: 14m Gin Eskimo, 10m Gin Eskimo III, 6m Gin Yeti, 4.5m Gin Yeti (custom bridle and mixer)
Fixed Bridle Quiver: MAC Bego 400, JOJO ET Instinct 2.5 & 5.5, Lil Devil 1.5, Sting 1.2
Rides: Ground Industries
View user's profile View All Posts By User
Prussik




Posts: 141
Registered: 12-5-2011
Member Is Offline


[*] posted on 10-31-2017 at 08:42 AM


Why not ?. Years ago end loops were tied instead of stitched with no ill effects. Of more than a dozen of my line sets all (except one) have knots. This is due to my use of extra long lines as well as experiments with Nasas.
View user's profile View All Posts By User
B-Roc


Avatar


Posts: 2917
Registered: 3-9-2006
Location: Massachusetts
Member Is Offline


[*] posted on 10-31-2017 at 09:11 AM


A blood knot is more a bend than a traditional knot. It has been well documented that knots weaken line strength significantly which is why most prefer sleeves when knotting or bends and braids to avoid knots all together.

This thread relates to accidental knots in the line (not rejoins) but the point is mostly the same. http://www.kiteforum.com/viewtopic.php?f=1&t=2373463&...




Depower Quiver: 14m Gin Eskimo, 10m Gin Eskimo III, 6m Gin Yeti, 4.5m Gin Yeti (custom bridle and mixer)
Fixed Bridle Quiver: MAC Bego 400, JOJO ET Instinct 2.5 & 5.5, Lil Devil 1.5, Sting 1.2
Rides: Ground Industries
View user's profile View All Posts By User
Prussik




Posts: 141
Registered: 12-5-2011
Member Is Offline


[*] posted on 10-31-2017 at 11:29 AM


Of course, knots weaken the line. The question is whether you need almost half a ton (2x220kg) of force to pull you along. I don't. So even if the strength is reduced to a half, it is still several times my body weight. In my only set without knots, for Dutch Flying Objects Nasa, I didn't have a spare set so I used brake lines for my power lines (and something like #150 fishing line for brakes and depower). No problems at all - hardly surprising since 2X150 kg is again a few times my body weight.
View user's profile View All Posts By User
John Holgate




Posts: 1510
Registered: 6-9-2009
Location: Australia
Member Is Offline

Mood: Cruising...

[*] posted on 10-31-2017 at 03:18 PM


I like B roc's idea of resleeving the line where the break is and using a shorter section/line extension (sleeved and larS-P-A-M-L-I-N-K-s headed to the end where it was broken) to get it back to original length. As Prussik points out, if there's still enough breaking strain left in the line with a knot in it, that will work. But personally, I hate the idea of knots in lines and would avoid at all costs.



Libre Vmax, Alloy Vermin buggy.
Ozone Access/Method/Riot/Imps/
Born-Kite Nasa Star 2's & 3. Born-Kite Long Star 3,5,7m. Peak 2 6m.
My Music is available here: http://www.soundclick.com/members/default.cfm?member=jbholga...
And here: http://www.cdbaby.com/Artist/JohnHolgate
YouTube vids here: http://www.youtube.com/user/quedecree?feature=mhee
View user's profile View All Posts By User
Chook


Avatar


Posts: 87
Registered: 10-25-2009
Location: Esperance Western Australia
Member Is Offline


[*] posted on 10-31-2017 at 04:35 PM


Yeh it ends up wrecking something when the lines are knotted.

Video is the result of a broken power line, which then puts all the load onto the back brake line and pulled all 7 brake tabs out of the trailing edge of a 5.4 Peter Lynn Vapor.

I have now had several knots break right on the knot in the sleeving and resulted in damage to the brake tabs on the kites. I stitch all my sleeving now.

Hot wiring puts MUCH more load onto your lines without the shock absorbing effect of a harness (which doesn't help either).

As you will see it wasn't under too much load and they are 250kg power lines. The "figure of eight" knots over sleeving just cant take it.

https://www.youtube.com/watch?v=tl-xiD5MK2g
View user's profile View All Posts By User
Glx


Avatar


Posts: 60
Registered: 2-28-2017
Location: Massachusetts
Member Is Offline

Mood: I need some more buggying!

[*] posted on 10-31-2017 at 05:27 PM


Thank you guys. I will resleeve the line and cut the other 3 to equal length. Where do you guys get sleeving material?
View user's profile View All Posts By User
B-Roc


Avatar


Posts: 2917
Registered: 3-9-2006
Location: Massachusetts
Member Is Offline


[*] posted on 10-31-2017 at 06:31 PM


Quote: Originally posted by Glx  
Thank you guys. I will resleeve the line and cut the other 3 to equal length. Where do you guys get sleeving material?


That is more work and equalizing 4 lines is a bit trickier than it would seem when resleeving especially when the lines are different strength (front/rear, brake/power). I might advise you to resleeve the broken and just use a longer pigtail/extension on that line to make it equal to the other 3. You can get sleeving at kite shops, use hollow core shoe-laces cut to length or hollow braid fiber from boating shops.




Depower Quiver: 14m Gin Eskimo, 10m Gin Eskimo III, 6m Gin Yeti, 4.5m Gin Yeti (custom bridle and mixer)
Fixed Bridle Quiver: MAC Bego 400, JOJO ET Instinct 2.5 & 5.5, Lil Devil 1.5, Sting 1.2
Rides: Ground Industries
View user's profile View All Posts By User
John Holgate




Posts: 1510
Registered: 6-9-2009
Location: Australia
Member Is Offline

Mood: Cruising...

[*] posted on 11-1-2017 at 03:19 AM



Quote:

and pulled all 7 brake tabs out of the trailing edge of a 5.4 Peter Lynn Vapor.


Didn't you do exactly the same thing upon launch on the claypan at Kingston? I seem to remember it was really windy though :D




Libre Vmax, Alloy Vermin buggy.
Ozone Access/Method/Riot/Imps/
Born-Kite Nasa Star 2's & 3. Born-Kite Long Star 3,5,7m. Peak 2 6m.
My Music is available here: http://www.soundclick.com/members/default.cfm?member=jbholga...
And here: http://www.cdbaby.com/Artist/JohnHolgate
YouTube vids here: http://www.youtube.com/user/quedecree?feature=mhee
View user's profile View All Posts By User
Chook


Avatar


Posts: 87
Registered: 10-25-2009
Location: Esperance Western Australia
Member Is Offline


sad.gif posted on 11-1-2017 at 03:49 AM


Quote: Originally posted by John Holgate  

Quote:

and pulled all 7 brake tabs out of the trailing edge of a 5.4 Peter Lynn Vapor.


Didn't you do exactly the same thing upon launch on the claypan at Kingston? I seem to remember it was really windy though :D


Yes John. I'd forgotten about the 2.7 Vapor That I blew to bits when the power line broke at the knot that day. Same repair to the kite was needed.
Had to upsize to 3.2 Vapor after having that disaster. Still couldn't catch Rob Lukin. ;)
View user's profile View All Posts By User

  Go To Top

Hosted by: Mad Moose Hosting