Break test results of various rigging slings constructed of 12 strand hollow braid

Here are some basic results. Because of time restraints, the side by side dead eye with brummel and dead eye with straight bury are constructed of 1/2 elevation Canada. The other slings are of 1/2 Tenex tec or 3/8 Tenex Tec. The purpose of doing the rigging slings in 1/2 was for an apples to apples comparison as close as possible.
 

Attachments

Good on you!! kudos!

Any chance you could add to the post mortem for those us with old man eyes and sagging intellect (ok I'm just lazy) a diagram of the setup (like some you gave the testers) with an arrow to the fail point?


Do you know if the test rig also measures length so you can get an idea of when/how the slinged configuration settles in to the load?
 
I followed the submission requests from arbsession.com as best I could. The dead eyes were around 12' long and straight pulled with the tail taking rounds on a bollard to test the splice itself. Slow motion video would be really helpful as well. I sent these off to be tested. The rigging slings were requested to be at least 4 feet in length and were girthed or choked onto a 4" bollard.

There is certainly room for more and improved I formation. I would like to have a dead eye tested, cow hitched on the bollard with the bight passing over the 2 legs of the eye with the entire splice on the bollard side as part of the cow hitch. This is more similar to how I use dead eyes for rigging hardware attachment. The straight pull is excellent for illustrating dead eye crane slings and balancers.

Another thing I would like to pursue is whip stitch vs lock stitch. If you see where the eye and eye broke it is different than anything else, comparably the dead eyes. It was the only sample where the splice itself was finished with a whip stitch.

Of my professionally spliced slings, I have a mix of both. If I send out another eye and eye with lock stitching, Then I will post it on the buzz.
 
If you do another round I'd love to see tests on an ultra sling with only 2 crosses between pockets and I'd be happy to cover that test and materials $
 
It occurred to me that a better test of the dead eye would be to have a straight pull of opposing, but the same, dead eye construction with space in between the buries.

I wasn't present for the breaking, nor do I have video. I am not sufficiently convinced that the dead eyes are not breaking where they are turned on a bollard. They all broke at the same place below the bury. None of the splices failed. On a couple there looked to be evidence of friction and flatness just below the break where I assume it came off of the bollard.
 
This was the closest dead eye to me.
 

Attachments

  • IMG_20250125_173929392.jpg
    IMG_20250125_173929392.jpg
    336.8 KB · Views: 5
  • IMG_20250125_173918756.jpg
    IMG_20250125_173918756.jpg
    289.2 KB · Views: 4
  • IMG_20250125_173905001.jpg
    IMG_20250125_173905001.jpg
    624.7 KB · Views: 5
john.massing said:
It occurred to me that a better test of the dead eye would be to have a straight pull of opposing, but the same, dead eye construction with space in between the buries.

I wasn't present for the breaking, nor do I have video. I am not sufficiently convinced that the dead eyes are not breaking where they are turned on a bollard. They all broke at the same place below the bury. None of the splices failed. On a couple there looked to be evidence of friction and flatness just below the break where I assume it came off of the bollard.
Click to expand...
It could also explain why the eye and eye constructed from 3/8 Tenex Tec broken at 100% ABS producing a failure in the splice.
 
You must log in or register to reply here.

New threads New posts

Kask Stihl NORTHEASTERN Arborists Wesspur TreeStuff.com Teufelberger Westminster X-Rigging Teufelberger
Back
Top Bottom