Thats kind of a long story. Back in the 1980's, The guys in British Columbia proposed the use of tandem prusks for belay. At the time, most rescuers were using a brake rack descender on a dedicated main line and tandem prusiks were the only thing that reliably arresten the load in a main line failure durring testing. The nature of tandem prusiks are that they must be minded with a propper technique and sometimes they accidentaly lock up. If they lock up on the belay rope, you are stuck. If you get locked prusiks, there are a couple of techniques to free them but if they are really stuck, you would use release hitch to introduce slack into the belay allowing you to free the tandem prusiks. Once free, you just tie off the hitch and continue. So in present day, Most rescuers consider the release hitch optional because its an extra piece of kit and you can for sure free the prusiks with one of severl techniques. You can also use the LRH to pass knots. There are many styles of LRH. The BC LRH, the Mariners LRH, the Hokie LRH, and the Radium LRH. If you are going to use a LRH, the Radium seems to be the current favorite. Finally, I must say that tandem Prusik Belay seems to be falling out of favor after nearly 30 years. The problem is that in practice, the human operator must perform really good technique to get good results and we see alot of bad technique out there. In practice drop testing, Tandem prusiks perform poorly about 10% of the time. Thats 1 out of 10 where the load moves a lot or hits the deck enve when rescuers are expecting the failure. Two Tension Rope systems are popular and the ASAP lock is also gaining popularity. Probably more than you wanted t know but there you go.
@@DRRRescue Interesting history. Is it safe to say that this is only used for descent? Also, there has to be a better way to fit both a strand of line and a munter hitch inside the same carabiner. I would think it would be much better to just use another carabiner on the same anchor point so the munter doesnt potentially walk on top of the other strand thats looped in with it to create the 3to1, you follow?
What is the point of making such a complicated knot?
What is this used for ??
Thats kind of a long story. Back in the 1980's, The guys in British Columbia proposed the use of tandem prusks for belay. At the time, most rescuers were using a brake rack descender on a dedicated main line and tandem prusiks were the only thing that reliably arresten the load in a main line failure durring testing.
The nature of tandem prusiks are that they must be minded with a propper technique and sometimes they accidentaly lock up. If they lock up on the belay rope, you are stuck. If you get locked prusiks, there are a couple of techniques to free them but if they are really stuck, you would use release hitch to introduce slack into the belay allowing you to free the tandem prusiks. Once free, you just tie off the hitch and continue.
So in present day, Most rescuers consider the release hitch optional because its an extra piece of kit and you can for sure free the prusiks with one of severl techniques.
You can also use the LRH to pass knots.
There are many styles of LRH. The BC LRH, the Mariners LRH, the Hokie LRH, and the Radium LRH. If you are going to use a LRH, the Radium seems to be the current favorite.
Finally, I must say that tandem Prusik Belay seems to be falling out of favor after nearly 30 years. The problem is that in practice, the human operator must perform really good technique to get good results and we see alot of bad technique out there. In practice drop testing, Tandem prusiks perform poorly about 10% of the time. Thats 1 out of 10 where the load moves a lot or hits the deck enve when rescuers are expecting the failure.
Two Tension Rope systems are popular and the ASAP lock is also gaining popularity.
Probably more than you wanted t know but there you go.
@@DRRRescue Interesting history. Is it safe to say that this is only used for descent? Also, there has to be a better way to fit both a strand of line and a munter hitch inside the same carabiner. I would think it would be much better to just use another carabiner on the same anchor point so the munter doesnt potentially walk on top of the other strand thats looped in with it to create the 3to1, you follow?