Skate Block/Tracking Line Hybrid Offset: Litter Through an A-Frame/Gin Pole Combination AHD
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- Опубликовано: 21 окт 2024
- Corrections: At 09:15 the red-gated carabiner that connects the pulley assembly to the yoke of the long-tail bowline should be on the other side of the bowline knot (i.e. in front of the knot instead of behind it) in order to prevent the rope from pressing/rubbing on the gate. The risk you run in clipping it in as shown in the video is an unintended opening of the carabiner, even when apparently locked.
I don't know how long it took you set that up but would a pivoting A-frame secured in the middle have worked? Would it have saved you any time?
Similar to a Gantry? Probably not a time saver... That would take more operators for sure. Plus the A-Frame would have to be a whole lot higher.... like Gold Strut kind of height. But interesting idea for sure.... Worth a visit to the old white board to sketch it out.
Great video!!! Very detailed explanation during all the development. In my opinion, the redundancy option is very good. In our academy the bowline knot is banned😢, we use figure 8 on bight most of the time...
Wow. Pretty extreme & micro-managerial to ban such a relevant knot. I'm sorry for you
Bob way to keep the bar high (no pun intended).
Sure thing
Bob I keep forgetting to ask? When you guys do twin tension systems for a raising or lower, do you guys put attachments on the waist? Or do you do one on the waist and one on the sternum?
For a rescuer on the end of the system, there's always a primary which is on the Ventral/Pelvic, and a belay/backup which is either @ Sternal or Dorsal (rescuer's choice) unless we're operating in a backcoutry environment w/ just a seat harness in which case both connections can go to Ventral. So now you're probably thinking "So which line is connected where?" My rigging philosophy: A lot of us have embraced the use of the Double/Interlocking Long-Tail Bowline... or any midline knot system that will bring both ropes together into a central point and then offer a continuation beyond the knot for a backup connection. This configuration works for all 2-rope applications/scenarios whether it be a two/twin tension system or single-main-single-belay system. So now, if we look critically, the rescuer's primary connection is via the yoke of the midline knot(s) to the Ventral point on the harness while the backup is on one of the long tails coming out.... End result: the rescuer is connected into two points on a 2-rope system one of which is a primary and one of which is a backup. The system belay ends at the yoke/MAP, or loop of the midline knot(s). So therefore it doesn't matter, from the perspective of the rescuer, which line does what. However, the anchoring landscape on the topside WILL influence the mode of operation (SM-SB vs. TTRS) & which line is going to do what task. Long winded response.... but they always are
This would be a GREAT video! Thanks!! @@Propeller_Head
... as for a patient in a litter, IF the patient is properly secured w/ internal & external lashing, then then the patient needs no further connections. If there is any concern, then one of the long tails can be attached to the litter as a backup should the litter bridle fail. In my opinion, under no circumstances should the backup long tail be connected directly to the patient. Unfortunately, most fire departments, training companies, & "RUclipsrs" commonly practice this, often without any critical thinking involved... it has become dogma.
Again I think this would be a great short video topic. Attachment point pros and cons and what works best.
Any particular reason you went with a skate block versus a cross haul?
Cross-hauls (two-rope offsets) only work when you have two high-points across a span that you are operating from that are not only high, but much higher in relation to the span... Basically it's an alternative to a reeving or drooping highline system. Since we only have one high point and it is located between the patient and the egress, cross-hauls (two-rope offsets), dynamic directionals (deflection offsets), & highlines are off the table as a transport option... the geometry of the landscape/canvas does not support these types of systems.
Sweet!
Very!