GWTW Forum

Kites! Kites! Kites! => Kite Building and Repair => Topic started by: Spz0 on May 28, 2009, 08:59 AM



Title: Best way to splice 2 lines together
Post by: Spz0 on May 28, 2009, 08:59 AM
On say, a broken lineset.
I've used a fishermans knot in the past, but the strength is not-so-great (on a 150# line, it gave way at about 75-85# of force).  I was using a simple overhand knot on each end, and was thinking of using a figure 8 knot or a stevedor's knot instead.
Maybe sheathing the areas to be spliced to give some added strength?  I don't know.  Thats why Im here.

Any sugg?


~Jon


Title: Re: Best way to splice 2 lines together
Post by: CTaylor on May 28, 2009, 10:14 AM
Look up a braided hollow core splice on youtube.  If you are breaking line constantly, it's time to update to a newer and possibly heavier test line.


Title: Re: Best way to splice 2 lines together
Post by: kiten00b on May 28, 2009, 10:45 AM
ask yourself... what costs more, a lost/damaged kite or kite out of control that injures yourself or someone else or a new line set?


Title: Re: Best way to splice 2 lines together
Post by: kairusan on May 28, 2009, 11:18 AM
You could try using a blood knot, which is known for its ability to maintain inherent strength of line (as opposed to the fisherman's knot, which is mostly about being easy to tie and not getting in the way of things).

I've never used a blood knot on kite line before (breaks always seem to happen for me right at the ends, near the sleeving where the line is weakest). But I've used it to repair a couple bridles and have never had a problem.

http://en.wikipedia.org/wiki/Blood_knot (http://en.wikipedia.org/wiki/Blood_knot)


Title: Re: Best way to splice 2 lines together
Post by: Spz0 on May 28, 2009, 11:44 AM
nice info on that bloodknot.  I'll have to try that out.
I managed to adapt a stevedor's knot with the fishermans knot.  Thinking that will work for my purposes.

Yes, yes, yes, a new lineset would be the way to go, obviously, but Im not in the position to afford one atm, thus the need to splice a line together.  ;)  Its a 150# lineset for a non expensive kite that doesnt have much pull, so Im pretty safe for the most part.


Title: Re: Best way to splice 2 lines together
Post by: normofthenorth on May 28, 2009, 08:05 PM
On bigger hollow-braid lines, I've made strong and neat splices just by pulling one of the lines inside the other for a few inches. I use a crimped piece of fine wire, like a sleeving tool.

It holds well, like a Chinese finger puzzle or finger trap. I.e., the outer part squeezes the inner part hard when it's under tension, so it won't slip out.

The only risk is that it will release like a Chinese finger puzzle -- i.e., somebody will compress/shorten the splice and slip the inner part out while it's under low tension.

For sailboat applications, I usually put in a few interlocked stitches (like from a sewing machine or a sewing awl) with fine thread, just to keep it from sliding. The stitches don't have to be heavy or strong or numerous, 'cause they're not holding anything when the line's under load, just when it's not.

If the end of the outside part isn't smooth enough, you might be able to improve it with some CA glue, or whip it with fine thread.

(I bought a tiny mile-long spool of Spectra THREAD on eBay a few years ago, and it would be perfect for this. Really super-thin stuff, only two strands, surprisingly strong like most Spectra. . .)

I'd try it, if I weren't awash in linesets. . .