Even if I'm not working in SAR I found this video very interesting and educational and some of the best HowNotTo videos in a long time. Maybe it's not so good for the algorithms but from an educational point this is perfect.
I agree, very educational, learned a ton as well. I think part is the depth of the subject as well as the detailed hands on explanations of all that is going on.
I have this lovely tool called a rope-jack, it's essentially a comealong that pulls rope of any length. The Maasdam is designed to work with old school three strand, half inch rope. Allegedly it has a 10 to 1 mechanical advantage, and being a continuous type puller, i dont typically have to reset often. I'd love to see the thing redesigned to work with modern kernmantle ropes, and maybe even a larger diameter. Another option is the Good Rigging Control System, commonly called GRCS, which is a hand powered capstan winch/bollard which is meant to be attached to a tree. It has two "speeds" 44:1 and 22:1, a 3300lb working load, and the ability to be run with a cordless drill. Its also over $3000. Anywho, just thought id leave this here to feed thoughts. There's plenty of cross-pollination to be had, and arborists have something to offer too.
At 08:48, you mention putting 7 pullers on a 5:1 mechanical advantage. The guideline I've heard from trainers is to keep "pull factor" (mechanical advantage X number of pullers) at around 20 to 25 max -- e.g. 6 pullers on a 3:1, 2 on a 9:1, 3 pullers on a 7:1 and so on (this training video covers it at 13:00 -- th-cam.com/video/24IE3glhdz8/w-d-xo.html ). Apparently, your pull factor of 35 didn't lead to any dire outcomes? Could you do some tests with high pull factor to see if you can break stuff (e.g. uproot anchors, break ropes, destroy pulleys)? Also, (7:56) on a low-angle litter operation, most of the weight is going into the slope via the attendants' legs rather than being borne by the rope system. You could demonstrate that with a load cell as well.
Can you prusik double ropes? th-cam.com/video/RxKE7JHLmZE/w-d-xo.html
Even if I'm not working in SAR I found this video very interesting and educational and some of the best HowNotTo videos in a long time. Maybe it's not so good for the algorithms but from an educational point this is perfect.
I agree, very educational, learned a ton as well. I think part is the depth of the subject as well as the detailed hands on explanations of all that is going on.
Great video. We were having some of these discussion at SAR tech rescue training last week. Thanks for the excellent and informative content.
Appreciate the SAR context!
Really liking these videos with Matt
Interesting and informative vid! More, please!
I have this lovely tool called a rope-jack, it's essentially a comealong that pulls rope of any length. The Maasdam is designed to work with old school three strand, half inch rope. Allegedly it has a 10 to 1 mechanical advantage, and being a continuous type puller, i dont typically have to reset often. I'd love to see the thing redesigned to work with modern kernmantle ropes, and maybe even a larger diameter. Another option is the Good Rigging Control System, commonly called GRCS, which is a hand powered capstan winch/bollard which is meant to be attached to a tree. It has two "speeds" 44:1 and 22:1, a 3300lb working load, and the ability to be run with a cordless drill. Its also over $3000.
Anywho, just thought id leave this here to feed thoughts. There's plenty of cross-pollination to be had, and arborists have something to offer too.
Interesting as always Ryan, thank you for uploading! 👍👍
ohhhhh he's GOOOOOOOOOD
looks like a fancy way of crevasse rescuing (moufflage / rope tackle ?)
hey, could it be a new way to equlize anchor points? if you have thick prussik on multiple strands of rope.. and some way to back it up
At 08:48, you mention putting 7 pullers on a 5:1 mechanical advantage. The guideline I've heard from trainers is to keep "pull factor" (mechanical advantage X number of pullers) at around 20 to 25 max -- e.g. 6 pullers on a 3:1, 2 on a 9:1, 3 pullers on a 7:1 and so on (this training video covers it at 13:00 -- th-cam.com/video/24IE3glhdz8/w-d-xo.html ). Apparently, your pull factor of 35 didn't lead to any dire outcomes? Could you do some tests with high pull factor to see if you can break stuff (e.g. uproot anchors, break ropes, destroy pulleys)?
Also, (7:56) on a low-angle litter operation, most of the weight is going into the slope via the attendants' legs rather than being borne by the rope system. You could demonstrate that with a load cell as well.
i feel like this was posted to the wrong channel?? an I tripping?