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- Feb 4, 2021
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Ok guys, platforms and sticks are not considered life safety and therefore the WLL factor is much lower than say climbing rope or your harness…. Typical rigging WLL (working load limit) for non life safety items is 1/3 the tensile strength of the rope or strap. Say you are using 1/8” amsteel and you splice it with a locked Brummell. For argument sake we will say the Brummell splice loses 20% (the number is different depending on so many factors to discuss here, but 20% is a safe number to use) so 1/8” has a breaking strength of 2700 lbs give or take…. The working load limit for that rope would be 900 lbs. now we subtract 20% for the splice so 1/8 amsteel would now be 2160 lbs with a working load limit of 720 lbs….
7/64 is where it gets tricky 1400 for the rope minus 20% would now be 1120 lbs. so 1/3 would be around 373 lbs. now keep in mind that this is brand new so with 7/64 it is safe enough to work but it doesn’t leave you much safety factor as the rope seasons… In my opinion either would work but 1/8 would last much longer as an attachment method.
Also someone said amsteel rope isn’t as abrasion resistant as nylon webbing. That is very very false. Rope is usually much more abrasion resistant than webbing and amsteel is far and away more abrasion resistant (and UV/water ect) resistant than nylon. I hear people mention the little burrs of split microfibers they get when using amsteel. All ropes do that it’s just easier to notice on dyneema because they are so slick that they separate and stand up. Polyester and nylon is heavier and the burred threads stay down more and aren’t as easy to see. If you ever want to test the abrasion resistance of nylon vs dyneema, get you a pair of scissors, get 1/4 nylon dock line and get 1/4 amsteel try to cut both of them without taping the section you’re cutting. One rope will cut in one or two passes of the scissors and the other will dull the blades and leave you practically sawing through it lol
7/64 is where it gets tricky 1400 for the rope minus 20% would now be 1120 lbs. so 1/3 would be around 373 lbs. now keep in mind that this is brand new so with 7/64 it is safe enough to work but it doesn’t leave you much safety factor as the rope seasons… In my opinion either would work but 1/8 would last much longer as an attachment method.
Also someone said amsteel rope isn’t as abrasion resistant as nylon webbing. That is very very false. Rope is usually much more abrasion resistant than webbing and amsteel is far and away more abrasion resistant (and UV/water ect) resistant than nylon. I hear people mention the little burrs of split microfibers they get when using amsteel. All ropes do that it’s just easier to notice on dyneema because they are so slick that they separate and stand up. Polyester and nylon is heavier and the burred threads stay down more and aren’t as easy to see. If you ever want to test the abrasion resistance of nylon vs dyneema, get you a pair of scissors, get 1/4 nylon dock line and get 1/4 amsteel try to cut both of them without taping the section you’re cutting. One rope will cut in one or two passes of the scissors and the other will dull the blades and leave you practically sawing through it lol