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Same here, but I have always used locked brummel splices. Going to make up a couple of eye and eye slings in 9mm tenex, brummel one end straight bury the other, and break them to see which gives way first.

I'v never spliced tenex that way, but talking to Pete last night he said 2 fid lengths for the bury, so on 1" cord I would expect a bury of 42".

Looks like the bury is too short to me, from the way the stitches have broken its just broke some fibres in the cover at the throat, and pulled the whole splice out. Not good.

Just been chatting to Pete McTree. How big is the eye on the sling? Is it a brummel type splice or a straight bury? 1" diameter rope is over large for the block, meaning the rope is compressed inside the block and the fibres cannot lie straight under tension, creating uneven loading. The...

The attachment point is too small, on all arborist rigging blocks. The load on the pulley is twice the load on each leg of the pull rope, therefore the attachment sling used must be stronger and larger diameter than the pull line. The pulley sheave is twice the diameter of the attachment...

A 5:1 safety factor is acceptable on hardware, but textiles should have a 10:1 safety factor for the reasons outlined by Wiley. If you never exceed that SWL then the sling will last for many duty cycles, ie one loading and unloading. Exceeding the SWL even once will negate the cycles to...

I make it nearer 14,000, but I work better in kilos anyway. It was a dead eye sling I presume? Was the eye large enough to comfortably fit on the block or did it spread the legs of the eye?

Two separate systems Al, so 15,000 pds doubled on the sling. Safety factor on textiles is usually set at 10:1, so the safe working load of your sling would be 4450 pounds. Doubling the 15,000 pd line pull would be exerting a 30,000 pd force, so about 6.75 times the safe working load. I...