Vector loading does indeed increase anchor loads exponentially. That said wire rope does stretch, maybe not as fast as a static/minimal elongation rope, but everything stretches. 9.5mm (3/8”) 7x19 IWRC EIPS wire rope has a minimum breaking strength of 6,500 kg (14,400 lbs). In an application where wire rope has replaced static rope the anchors should also be upgraded to appropriate strength to maintain a 5:1 safety factor. Also there is a limit to the length any rope can span (wire or static) and still maintain an appropriate safety factor. I would be hesitant to rely on double 9.5mm wire ropes beyond a span of 365 meters (1,200 feet) in this application. The weight of the material it self becomes a factor at long lengths, as the above mentioned cable weighs .37kg/m (.25#/ft).
Great video. I’d like to have seen the preload tension on the rope at each stage prior to adding the weight. I’ve been on courses where they have simply refused the idea that the preloading make a difference. Does it or doesn’t it?
Very good, I am interested in the figures if the diameters of the ropes are greater say 11mm and the tightening system is using prussics an pullies with 50 mm slings on bombproof I beam anchors, where the weakest link may lie...especially with say 50kg drops of say 1 meter....?
Great video, thank you. But I stay with a question: so what do you recommend if I want to install a zipline with wire? How can I make the calculation? Thanks in advance
Super clear and creative! There are still a couple of questions lingering in my mind after this video. Like is your rope static or dynamic. What kind of objections do you have when you are using prusik knots are Grigri? Keep up the good work it's the clearest explanation of this topic that I've yet seen!
We use low stretch rope - 11mm EN 1891. When I've pull-tested them, prusik knots behave unpredictably. Grigris are belay devices for rock climbing - in both cases a stronger, industrially rated item, is available, so we use it!
Great informative video! Me and a few friends did simular testing 2 weeks ago. I came to the same conclusion that it is really hard to go over 160 degrees without resorting to crazy mechanical advantage systems. Which is a good thing ofcourse. Did you do any testing when using the ID as a progress capture and see when it starts to slide? Oh and what app are you using to measure the angle?
Great video, these forces generated can really overload the anchors. Thank you again.
Thank you for sharing the knowledge!
Very eye-opening. Thanks for sharing all that knowledge, even in those other videos. I really appreciate!
Found the App he's using. It's "AngleMeasure" by Pool Night Studios.
Excellent presentation. Thank you!
Vector loading does indeed increase anchor loads exponentially. That said wire rope does stretch, maybe not as fast as a static/minimal elongation rope, but everything stretches. 9.5mm (3/8”) 7x19 IWRC EIPS wire rope has a minimum breaking strength of 6,500 kg (14,400 lbs). In an application where wire rope has replaced static rope the anchors should also be upgraded to appropriate strength to maintain a 5:1 safety factor. Also there is a limit to the length any rope can span (wire or static) and still maintain an appropriate safety factor. I would be hesitant to rely on double 9.5mm wire ropes beyond a span of 365 meters (1,200 feet) in this application. The weight of the material it self becomes a factor at long lengths, as the above mentioned cable weighs .37kg/m (.25#/ft).
i've got this question for years, now I got an answer, many thanks
Great video. I’d like to have seen the preload tension on the rope at each stage prior to adding the weight. I’ve been on courses where they have simply refused the idea that the preloading make a difference. Does it or doesn’t it?
Great video, my friend
Really appreciate the great work your doing. Thanks mate
Thanks for sharing guys, great to see the theory put to practice.
Excellent demonstration.
Awesome video and very informative !
Great Video!!! thanks for all the info
Well explained and great demonstration, thanks for sharing
Very good, I am interested in the figures if the diameters of the ropes are greater say 11mm and the tightening system is using prussics an pullies with 50 mm slings on bombproof I beam anchors, where the weakest link may lie...especially with say 50kg drops of say 1 meter....?
Great video, thank you.
But I stay with a question: so what do you recommend if I want to install a zipline with wire? How can I make the calculation?
Thanks in advance
Super clear and creative! There are still a couple of questions lingering in my mind after this video. Like is your rope static or dynamic. What kind of objections do you have when you are using prusik knots are Grigri? Keep up the good work it's the clearest explanation of this topic that I've yet seen!
We use low stretch rope - 11mm EN 1891. When I've pull-tested them, prusik knots behave unpredictably. Grigris are belay devices for rock climbing - in both cases a stronger, industrially rated item, is available, so we use it!
Great informative video! Me and a few friends did simular testing 2 weeks ago. I came to the same conclusion that it is really hard to go over 160 degrees without resorting to crazy mechanical advantage systems. Which is a good thing ofcourse.
Did you do any testing when using the ID as a progress capture and see when it starts to slide?
Oh and what app are you using to measure the angle?
Thanks, great video. Do you think using a Italian hitch would be safer than using hardware, ie I'd, stop,rig?
Well explained, thanks!
Thanks, great video, do you think Italian hitch locked off would be safer than using I'd, stop, ect? Or too much friction?
Cheers
Hi, are you shure that the measurement of angles si ok making ir with diferentes sides of your phone ?
What beaks first? Anchor or rope?
Thanks for the vid.
Very useful.
Is the weight the same if you double one rope or do you really need two different ropes?
What do you recommend?
what tension on main rope ?? If on each side force 100kg left and 100kg right than on rope it will be 200kg ?? thanks.
Bell video. Buon lavoro..grazie!!
Whats that app called?
can you do some more videos on rescue rope gear please
that's brilliant! thank you!
So my weight is 117 kg. If i want to work on this area should i lose weight?
Anyone work out what the app is at all?
nice app you got on your phone !! whats the name of it please ???
Awesome
For flying fox’s in advanced rigging we weigh X span, divided by 4X the sag in the line. min sag = span X0.05
is that Tyrion Lannister?
Bizimkiler de böyle video yapsa ölürler! Bişey öğreniriz sonra Allah korusun 😏
very well explained , thank you!