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  1. #21
    Forum Member MichaelXYZ's Avatar
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    The other thread (Critique my rescue) got me to thinking about some things. I am somewhat afraid to ask this, as I don't want to look to silly. Well, using a 4:1 as I know it using a double sheave pulley setup I am at a loss on something.

    Some background:
    In our training, the Z-rig is the ex-post-facto the de-standard. We have briefly covered the 4:1 for confined space, but not in much detail. I have been struggling with how a reset would be done with a pulley system as pictured in previous post above. Below is a bad drawing I made trying to figure out how it would be done. Would someone care to unhose me here? I am just not seeing how you can reset a block and tackle 4:1 setup.

    Thanks

    Name:  4to1reset.jpg
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  2. #22
    Forum Member jdcalamia's Avatar
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    In your Fig. 2, I would throw tandem prussics on your main line and have someone take up the slack as you're raising the load w/ the 4:1. Requires an additional man, but not much else you can do. As far as putting your 4:1 on your tri-pod, I personally stay away from any MA in the hole, it just cleaner that way, plus gives you the opportunity for a longer hauling field by bolting the MA onto your mainline. I like to use a single lower line on an ID and convert that to a 3:1 for a raise outside the tripod footprint. I leave a 5:1 extended ready to bolt onto the 3:1 incase the 3:1 isn't doing it. Understood that sometimes this can't be done, but that's my "ideal world."
    John D. Calamia, BS, NREMTP, FP-C
    Firefighter/Flight Paramedic
    Broomall, PA

  3. #23
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    Quote Originally Posted by jdcalamia View Post
    In your Fig. 2, I would throw tandem prussics on your main line and...
    Without checking to see if this topic has been beaten before, what is the rationale for using two ratchet Prusiks instead on one? One works fine. Two seems like redundatitus. There is a belay also...

  4. #24
    Forum Member jdcalamia's Avatar
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    Quote Originally Posted by EricUlner View Post
    Without checking to see if this topic has been beaten before, what is the rationale for using two ratchet Prusiks instead on one? One works fine. Two seems like redundatitus. There is a belay also...
    You got me Eric, old habits die hard! I'm still working on weeding out the redundatitus, it takes time.
    John D. Calamia, BS, NREMTP, FP-C
    Firefighter/Flight Paramedic
    Broomall, PA

  5. #25
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    Quote Originally Posted by jdcalamia View Post
    You got me Eric, old habits die hard! I'm still working on weeding out the redundatitus, it takes time.
    Fair enough. I'm thinking that such habits are... because that's the way I was told to do it by such and such instructor.

  6. #26
    Forum Member FiremanLyman's Avatar
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    If it is not a "long haul" but a rather short lower, I like having the MA off the tripod and into the hole as the mainline. My rational, I hate playing the angle game keeping my forces inside the tripod legs.

    Have a piggypack MA set aside for rescue/recovery on the belay (safety/tag) line.

    With Micheal's question; there is not a good reset with a 4:1 piggyback into a hole. I'd either piggyback outside the tripod or use the whole MA as the main line.

    Side note to derail the topic; we did a training entrant recovery using the dorsal attachment the other day. The down rescuer (me) was in under a few pipes. I tried to play limp as possible. Sucked, but worked. Used the Mainline MA in the hole on the tripod, piggy backed it onto my recovery (safety/belay/tag) line. After a dozen resets, I was hanging like a rag doll up above the hole.
    ~Drew
    Firefighter/EMT/Technical Rescue
    USAR TF Rescue Specialist

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