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Rope Access: Is the death knot a myth???
🕑 Added 2021-05-02 12:00:03 +0000 UTCMikey Stevenson and I collabed to learn more about the scaffold knot which is commonly used in the rope access industrial world. It cinces up against the carabiner to make a knot with a lower profile and it holds the carabiner in place. We also use it in highlining on some leash rings that are designed as thimbles. We tested it tied normal of course but also the tail strand put in between the loop. It had no affect on how the rope functioned or its strength. We also tied it wrong so you have to pull the tail to cinch it up, which means the tail becomes loose if you weight it, pulling it undone completely which is how it got the clever name - The Death Knot. What happens is the death knot, if pulled tight before testing, has the tail side trying to get pulled out at the same time the load strand side is cinching up and squeezing the tail. In all three of our tests, the rope broke at almost full strength and did not slip. THE DEATH KNOT IS STILL DANGEROUS but it is interesting how it works. At the very end (after the jingle), we demonstrate how it can fail easily.
Go subscribe to Mikey’s Channel - @The Rope Access and Climbing Podcast
Our break test were done with a new 10mm static climbing rope Test 1: 8 to 8 - 18.80kN Test 2: Scaffold knot #1- 20.80kN Test 3: Scaffold knot #2 - 18.90kN Test 4: Scaffold knot variation #1 - 18.52kN Test 5: Scaffold knot variation #2 - 18.42kN Test 6: Death Knot #1 - no peak hold - strong! Test 7: Death Knot #2 - 17.70kN Test 8: Death Knot #3 - 15.56kN
Highline leash thimble episode https://youtu.be/3Gs6h5KL4DY
Other highline leash thimble episode https://youtu.be/9fBkTmdXouU
