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Old 30-12-2014, 08:10   #1
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Dyneema Fishbone?

So I ran across this "Fish Bone Knotless Gear Tie" thingy awhile ago on some backpacker blog. Didn't think much of it at the time, why not just tie a knot?

Mainly I was interested by the fact that the guy started a Kickstarter for it asking for $1,000 but now has almost $90,000 pledged for it, which seems crazy to me because knots are free and don't weigh anything for backpackers.

Then other night I started wondering if the concept could be adaptable for use as a method of attaching a snubber to a Dyneema anchor line?

If I understand the FEA model correctly it is showing the Load Transmission in bright red, as a measure of friction or grippyness, not failure of the material.

Any thoughts?

https://www.kickstarter.com/projects...tless-gear-tie
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Old 30-12-2014, 08:49   #2
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Re: Dyneema Fishbone?

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Old 30-12-2014, 09:00   #3
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Re: Dyneema Fishbone?

Knots do not generate any revenue for anyone.
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Old 30-12-2014, 10:23   #4
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Re: Dyneema Fishbone?

Quote:
Originally Posted by Delancey View Post
If I understand the FEA model correctly it is showing the Load Transmission in bright red, as a measure of friction or grippyness, not failure of the material.
The FEA screen shot is showing the stress gradient of the material under load. It's a function of the shape of the material, the material properties entered into the program, and the load and constraint assumptions made by the human inputting the information. The picture shows no units, or the value of the load. The color is just a scale; I usually try to set it so that anything red is passed the ultimate strength of the material (or yield strength if I'm looking to minimize plastic deformation). Not knowing the units or material, or how the human setup the loads or constraints, I couldn't tell you anything more! But seeing how the second image shows a displacement, it's most likely showing failure of the material. But why is there no stress near the eye?


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Old 30-12-2014, 11:16   #5
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Re: Dyneema Fishbone?

Couple design process photos, looks like the inspiration was fishing tackle. Go figure. Something like that would be stupid simple to scale up using stainless round stock.
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Old 30-12-2014, 13:22   #6
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Re: Dyneema Fishbone?

Well, ignore the Fish Bone as being an overly complicated highly stylized version of something quite simple with plenty of prior art. What ever the FEA model is showing doesn't matter.

The fact that this method is used successfully to attach fishing lures specifically to SPECTRA BRAID suggests it's suitability for a snubber attachment to a Dyneema rode.

Maybe if we're lucky Estarzinger will consider testing it if I send him a mock-up
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Old 30-12-2014, 14:24   #7
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Re: Dyneema Fishbone?

I would think the first modification you might suggest is to make it out of round stock. The bend going through the "eye" looks very sharp, and looks like a serious chafe spot to me.
Not a big deal if your fishing line breaks, worst case is a lost lure.
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Old 30-12-2014, 15:01   #8
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Re: Dyneema Fishbone?

Stupid simple. No money in that!

Easy enough to size stock by pin diameter. Seems like a couple different ways to make the hitch at the top but easy to add wraps for strength as required. Would need to test to tell how many.

Piece of cake to tie in middle of line. My guess is stronger than a splice.

Dyneema anchor rode anyone?
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