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Author Topic: Wing tip tensioning  (Read 3331 times)
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sugarbaker
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« on: December 09, 2011, 08:40 PM »

option 1, sewn in loop



option 2, hole in leading edge


I've used both styles in my builds, but I'm curious to know what the general preference is.  Feel free to post reasons for your opinion.  Thanks!
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B-13
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« Reply #1 on: December 09, 2011, 08:49 PM »

OPTION 1

The hole techniques always looked risky for me. As if the line will rip the material in the LE.
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AKA_MrBill
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« Reply #2 on: December 09, 2011, 09:01 PM »

OPTION 1

The hole techniques always looked risky for me. As if the line will rip the material in the LE.
+1 for option 1.
B-13 nailed my thoughts exactly.
Granted I'm fairly new at this, but my experience as an Engineer tells me the hole in the LE is a might risky.

Just my $.02
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Kantaxel
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« Reply #3 on: December 09, 2011, 09:03 PM »

I prefer holes, but have had better luck with kites with a pair of holes like Lam's or at least some of the Flying Wings products.    Shocked
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tonycarl60
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« Reply #4 on: December 09, 2011, 09:04 PM »

Hole method looks cleaner though..............
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B-13
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« Reply #5 on: December 09, 2011, 09:11 PM »

Anyone had a ripping LE material from tensioning or a gust that gave stress on the tension line?
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sugarbaker
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« Reply #6 on: December 09, 2011, 09:31 PM »

Focus kites and Skyburner both use a single hole in the leading edge.  I've built a couple of kites that use this method.  I've actually never had a problem with them ripping out.  I have also used a 2 hole method... a combination of Flying Wing and Skyburner's system.  I also know that Lam uses three holes (although, I don't own one of his kites yet, so have not learned how the design holds tension). 

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tpatter
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« Reply #7 on: December 09, 2011, 10:59 PM »

I prefer Lams system to any others that I've tried.  The downside is that you've got to watch his video of how to tension them in order to know how to do it.

For simplicity, I like BMKs system, but I've seen lots of folks put those on wrongly as well.

By far, my least favorite is the QPro lashing system - you've got to be a boyscout in order to get that one done well.

-Tom
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mikenchico
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« Reply #8 on: December 10, 2011, 01:06 AM »

I've never had the holes in 3.5 oz Dacron rip or elongate.

I still prefer the "Blue Moon" system because the fixed pigtail makes tensioning evenly side to side easier and repeatable although I seldom break down kites. I do worry more about the sewn in loop breaking then I worry about the holes in 3.5 oz Dacron tearing out though. If I was building an light kite using 1.5 oz or lighter leading edges without re-enforcement I would definitively use the sewn loops over holes. BTW I've heard Kens system on the Blue Moons was inspired by an early Prism design and he got Prism's permission to incorporate it into his designs.

I'm not fond of the multi hole systems that i have to read instructions and watch videos in order to put a kite together, what is their advantage?

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fidelio
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« Reply #9 on: December 10, 2011, 02:23 AM »

two holes, an hq split knock, and a vinyl end cap is my preference.

it would seem two holes could reduce the load on each by half if the tensioning line loops through both.
if you're worried about the hole expanding you can stiffen the wingtip by incorporating a thin piece of plastic when you sew it. check the wingtip on a late model benson kite, it's as stiff as a credit card or driving license.

i've seen enough sewn in loops like in option 1 get worn and frayed enough through proper use to appear suspiciously weak, and nightmarish to replace should it fail.

for me as a flyer, the holes are better, cleaner, and more reliable.
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Kantaxel
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« Reply #10 on: December 10, 2011, 03:20 AM »

I have a couple of kites made by a now deceased builder, where single holes were reinforced with metal grommets.............the grommets failed but the holes remain-unblemished and functioning as well as the grommeted holes. One model used bungies and the other bridle line...................no difference with either.
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tpatter
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« Reply #11 on: December 10, 2011, 07:07 AM »

I'm not fond of the multi hole systems that i have to read instructions and watch videos in order to put a kite together, what is their advantage?

I'm exaggerating perhaps a bit on the complexity - like I said even a simple system like BMKs is often put on incorrectly by sliding the knot in the notch rather than the loop itself.  Without instruction, most new flyers can't even larks heads their lines to the kite! Smiley

The advantage is mostly cosmetic I imagine - it looks very clean and requires no end cap.  I've never liked a strand of  line whipping on the end of the LE like many do as it eventually frays and looks ratty.   It also works really well, I've had some setup for years now - set it an forget it.

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Will Sturdy
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« Reply #12 on: December 10, 2011, 07:36 AM »

I use a two hole system. Clean and simple Smiley
It can tear if the dacron layup is not thick enough, so I fold over the ends to double up the thickness. When using 1.5 oz nylon, I double over the nylon as well as adding a dacron doubler.
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Michel
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« Reply #13 on: December 10, 2011, 10:07 AM »

OPTION 1

The hole techniques always looked risky for me. As if the line will rip the material in the LE.

+1 for option 1.

+ 2 for option 1 too.  Wink
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kitebug
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« Reply #14 on: December 10, 2011, 07:58 PM »

I have done both on kites I have build, never had an issue with either.

Lately I have been going with hole version and using an 2.2 26" flat bike inner tube, cut out rings about 1/4" and use them as bands to tension with good result; the rubber in the innertube is stong enough to provide good tension and if it brakes I can cut hundreds more if needed. And no need to tie anything no snags either. The 2.2 tube gives me a good size band based on the location of the hole to the end of the nock

I will try and post a photo.

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Volando!
Cisco
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