Syncro 4&4 Discussion and Q&A last answered over 2 years ago.
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ninja.turtle007 wrote:
8t rope 8m long with 4.75t tested bow shackles.
Curious to know why you are using a rope with a higher rating than your shackles.
That means when something gets over loaded and fails, it's your shackle rather than the rope, which means you now have a lump of metal at the end of a tight rope... Aka, a projectile.
Good point. When I bought my rope I asked for tested shackles to come with it. I was supplied with 4.75t tested shackles. I presummed these were correct.
I can clearly see the dangers of using these with a kinetic rope but how much elasticity is there in a nylon rope?
not much elasticity compared to kinetic, but the tension will give you a real PING you can get small dents with just the rope hitting the body work when it snap's!
i need to find a way to store all this stuff that's out the way now!
I emailed Rope Services about a the rope and shackles they sell.
They responded with this.
Hello Tom,
Thanks for your message hopefully this will help with your query.
The rope itself has a minimum breaking load (MBL) of 11.5 tonne depending on the situation you are using this recovery rope in (on road / off road, sand - mud - bog) it is recommended that the MBL of the rope is reduced by a ratio to a working load limit (WLL) to suit the conditions. Generally in most recovery applications it is normally a rolling load on a flat surface so reducing the rope to a say 2:1 will give a WLL of approx 5.75 tonne and in difficult conditions say off road in rain and mud which would be the worst scenario reducing the MBL by 6:1 which will give a WLL of approx 2 tonne which will cover the weight of most vehicles needing recovered. (large in take of breadth.)
The shackles are always quoted using the WLL and not the MBL so the the shackles we supply are 4.75t WLL and the MBL of them is 4:1 which is aprox 20 tonne.As these shackles take a tremendous amount of snatch loading we always recommend that the WLL is approx double the WLL of the rope assembly.
I hope this information is of help and should you require any further information;please do not hesitate to contact me at any time.You can also find our telephone number and other contact details at www ropeservicesuk com
