@@tedjohnson401 My understanding is that the inneficiency of using carabiners vs actual pulleys with bearings is so absurd in this setup that it creates enough static friction to hold it all together. Of course, dynamic friction is lower and you can do some tricks like pulling sideways to overcome the initial inertia, but you're using a lot of energy to pull the rope through the carabiners compared to pulleys. According to RopeLab: "Large sheave (50mm), ball-bearing pulleys are 85-90% efficient. Small sheave pulleys, ball-bearing pulleys are 80-85% efficient. Bushed pulleys are 65-80% efficient. Carabiners (used as non-spinning pulleys) are 35-45% efficient". So you can get almost triple the efficiency with a top notch ball-bearing pulley vs a rough surface carabiner. I'm curious though if ~triple the tension would make those bearing internals start rubbing and act the same as the carabiners -- if the parts of the system can hold such tension in the first place. Nonetheless, it's a very interesting setup that reminds me of the Trucker's Hitch.
They were talking about using it to unwrap a boat in swiftwater. Tie the bow to the stern and taco it off the rock. Lean on the line, then pull out the slack with the pulling both ways method. Good practice is using it for clotheslines at camp.
In theory it could be used as you mentioned. There are a few issues in the real world: 1. The person left on the boat rarely knows how to construct it 2. There is not always access to the needed d-rings and bow line when a boat is wrapped 3. This may work on an empty boat but is unlikely to work on larger gear rafts
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
Just set it up in the backyard. That’s freaking magic.
Yep
I can’t understand how it is capturing the tension….
Friction
@@tedjohnson401 My understanding is that the inneficiency of using carabiners vs actual pulleys with bearings is so absurd in this setup that it creates enough static friction to hold it all together. Of course, dynamic friction is lower and you can do some tricks like pulling sideways to overcome the initial inertia, but you're using a lot of energy to pull the rope through the carabiners compared to pulleys.
According to RopeLab: "Large sheave (50mm), ball-bearing pulleys are 85-90% efficient. Small sheave pulleys, ball-bearing pulleys are 80-85% efficient. Bushed pulleys are 65-80% efficient. Carabiners (used as non-spinning pulleys) are 35-45% efficient". So you can get almost triple the efficiency with a top notch ball-bearing pulley vs a rough surface carabiner. I'm curious though if ~triple the tension would make those bearing internals start rubbing and act the same as the carabiners -- if the parts of the system can hold such tension in the first place.
Nonetheless, it's a very interesting setup that reminds me of the Trucker's Hitch.
They were talking about using it to unwrap a boat in swiftwater. Tie the bow to the stern and taco it off the rock. Lean on the line, then pull out the slack with the pulling both ways method. Good practice is using it for clotheslines at camp.
In theory it could be used as you mentioned. There are a few issues in the real world:
1. The person left on the boat rarely knows how to construct it
2. There is not always access to the needed d-rings and bow line when a boat is wrapped
3. This may work on an empty boat but is unlikely to work on larger gear rafts
@@GearGarageTV well for point 1, then learn lol
It reminds me of a trucker's hitch with the ability to capture progress.