Destruction Test - 4mm Dyneema Soft Shackle 

get a 250kg pocket chain hoist.

@@yaykruser thanks...will look into that.

The SWL is usually shown as half of the actual breaking strain.

Yes, SWL is for lifting. Recovery Load Limit (RLL) is 4/5 of the breaking strain.

Where do you get these soft shackles? Thank you.

@@leesire I make all of mine myself. You can buy soft shackles on ebay and many other places too. Ebay is probably the easiest though.

@@TruBluOffroad I saw them on Amazon. Neat stuff! Thank you

1/5 of breaking strain is generally the calculation used to determine safe working load ratings. Whether dynamic or static, things still let go at the same breaking strain. The key part to understand is that even a 10kg load can create a tonne of force. It just depends how fast it's moving and how harsh or gently it comes to a stop from that speed.

@@TruBluOffroad I also figured out that I would prefer my cheap dyneema shackle to break before my not so cheap mast. Knowing which part you'd prefer to fail is something worth deciding in advance.

That's right. 👍

A lot. If you want to send me one, I'd be happy to test it to find it's breaking point.

Yes at the knot. Theoretically with two lengths of 4mm dyneema at 1800kg BS, then used basically in a basket configuration, should give 5.2t BS but they are weakened dramatically by the fact that the strain can not possible be distributed evenly through all strands of dyneema, particularly in the knot, and also the squeezing effect of the knot is like a cutting force at that level of strain.

@@TruBluOffroad Richard Delaney from the Rope Test Lab and others have instituted a very simply formula for derating soft goods when tied in a knot. Derate by 50%. No arguing over small differences in various knots. Makes it super easy to calculate your safety factors then.

🤣 I'm guessing Tonya never looks at youtube then? 🤣

That's not funny where I live in America girls can be 300 plus pounds and they're all about how beautiful they are

Wow! Yeah you definitely got scammed with that one. Dyneema is super strong stuff.

Well let me know if there's any other bits and pieces of rigging or whatever that you want to see tested.

@@TruBluOffroad ok. Thank you Cheers Gray

is it uv resistent?

@@haynillesen I Googled Dyneema rope uv resistance It is repeatedly claimed to be highly uv resistant Cheers Gray

I believe Amsteel is a trademark name but is still made of the same stuff. So same strength. 👌

Oh good pick up, thanks. Let's get that decimal point in there. 👌

If you've got a length you can send me to test, I'd be happy to destroy it.

So the shackle should bust at around 220% strength

@@aaronho4242 The maker of the video commented that the shackle fails at the knot. So although, as a loop, it would be 2 x 4mm as Jeffrey Fay points out it actually fails earlier, because of the knot. I think it would be much less than 220%.

Just a standard diamond knot style. It's not the strongest style of soft shackle but yields the most breaking strain per amount of dyneema used.

@@TruBluOffroad word! Just curious which one it was.

I think you just said it.

Not quite. Dyneema handles tight bends really well as opposed to steel wire rope. Yes sharp edges may cut the dyneema but that isn't really referred to as a breaking strain, similar to the dyneema having damage from wear and tear. This style soft shackle always let's go at the knot.

Because this is to test the soft shackle, not the dyneema it's made of. The 4mm dyneema has a breaking strain of 1900kg according to the seller.

I searched for 4mm dyneema. I purchased 4mm dyneema. I received 4mm dyneema. I cut and constructed the shackle from 4mm dyneema. If I'm calling it 4mm dyneema it's 4mm dyneema. ;]

Well Scotty Malone.. I say this because from this side of the fence against those shackle the rope looks bigger than 4mm. It may just be the camera angle and those shackles are like 8-10mm And the timber they’re sitting on is a tooth pick. How big are those shackles.

@@andrewsciacca6219 firstly are you aware of how these soft shackles are constructed? They are made by splicing the dyneema rope back through itself. So they generally appear to be nearly double the thickness, but are still referred to by the thickness of the rope they're made from.

@@TruBluOffroad Thanks Scotty, it may be the way the vid is taken and the angle, but those steel shackles look rather large. As for how these work I have a full understanding. My opinion is that everyone is making and using the same design type, they all have the same unreliable problem, failure at the knot. Friction behind the knot causing heat damage as the rope is elongating causing failure.

@@andrewsciacca6219 that's not just your opinion. It's a fact. Any rope, unless cut or damaged by a sharp edge, will always break at its knot. Just like straps will always fail where they're sewn, unless damaged elsewhere to a level that causes that particular area to be weaker than where it's sewn. Every object has a weakest point and will always fail at that point. Bow shackles are no exception. If I was testing them, they'll always fail at the end of the thread on the pin. There is other soft shackle construction designs and I've given them all a go. But it seems that this basic design is still the most efficient design in terms of strength for the amount of material used. And yes the bow shackles I'm using are big. The shackles connected directly to the load cell are 25t SWL, which are used because they are the corect fit for the 50t load cell. The smaller ones are 18t and 12t.

I'm sorry, I didn't know that when doing a destruction test I had to spend thousands on a peak hold high hertz load cell and do clinical analysis of the failure. My bad. :P

@@TruBluOffroad - iPhone records 60fps, Samsung claims 480fps. Looks like you recorded at around 10fps? A shaky 10. Most gauges have peak-hold and yours probably does too. Analysis might be as simple as showing the break? Did the break occur at the knot? Because it looks like the break occurred on the backside of the left metal-shackle, leading one to wonder if the metal-shackle was smooth or if it caused the failure? Maybe you're just not cut-out for testing?

@@tomnoyb8301 I wish it did. I've been meaning to contact the distributor to find out the cost and availability of a recording controller but probably still more money than I'd like to spend. I recorded at 60fps but uploaded at much less. Maybe there's people out there that are willing to go to great lengths for their youtube vids, but I'm not that person. My vids might be interesting to some, not interesting to others. I'm easy either way.

@@tomnoyb8301 oh and yes the shackle broke at the knot where this design soft shackle always breaks. And yes there are stronger designs which use more material. I have found this design to give the best strength/size/material used ratio. Maybe I'll do a comparison vid of the different designs with their strength, material used etc etc.

Mr Nyobs channel is also a little short on such content. 🤔