Deconstructing the Set of Fours

Confused on whether your block and tackle is a 4:1 or a 5:1? Good news, it's both! Let me prove it to you along with a great application for your set of fours at the end of the video.

[@kevinguzman6504]

Thanks for making this video! It really helped!

[@perryfire3006]

Good. Happy to help.

[@SapioiT]

The 9:1 configuration is really interesting! Thanks for sharing!

[@perryfire3006]

Thanks for checking it out. Cheers

[@SapioiT]

@@perryfire3006 My pleasure! Thanks for the great videos! I think it would be interesting if you made parallels to it using other techniques. For example, instead of a set-of-fours or tackle-block, you could use a lever (a wooden or metal rod; to pull closer without dropping), a reduction pulley (like for a hand-cranked water well pulley), reduction gears (to decrease the speed and increase the torque), and so on.

[@perryfire3006]

@@SapioiT Interesting concept. Maybe once the rope concept is played out it could be something to explore but I still have a ton of ideas for more rope videos. Thanks for an interesting thought.

[@SapioiT]

@@perryfire3006 My pleasure! Thanks for the interesting videos!

[@68omer]

Really nice and interesting video. Wich is the right lenght or the maximum lenght of the set of fours? I am trying to lift up a tower, but the two anchoring points are about 12m (40 ft) from each other, the set of fours each time roll it up and became very hard to work. The 9:1 looks more efficient. Thank you and sorry for my terrible English...

[@perryfire3006]

If you are trying to raise something 12 meters then a set of fours becomes pretty clumsy and heavy, although technically it would work if the rope were long enough in the system. That's a lot of rope though. Better to put a high directional COD (change of direction) pulley above your load and create a haul system on the ground such as a 3:1 if the load is light enough. Maybe I'll make a video on something like that in the future. And don't apologize for your English, it's fine. Thank you for commenting.

[@gbcrofton]

what double pulley?

[@perryfire3006]

CMC

[@Larry.Luciano]

I just finished rope tech. Your opinion do you think the instructor allowing us to only have 2 repels practicing pickoffs, 1 using a strap and 1 using an aztek pro sufficient time & reps to be timed for a practical test 4-6 days later without having the ability to practice in between that time frame? We were told study the handed out book. He gave us no reference videos. Don’t you think that’s teaching failure? Thanks!

[@perryfire3006]

I'm not going to comment on your instructor since I wasn't there but more than likely he is having to work under a constrained system, meaning he probably got allotted so many days to accomplish whatever task he was asked to complete. This happens all of the time in the Fire Service and it shortchanges students. The more students, the worse it becomes. When my son graduated Army boot camp he complained that there wasn't enough range time to complete his expert marksmanship so the problem is everywhere. So don't get mad at your instructor, just realize he's working under a system he has little control over more than likely. Now a little pushback: why can't you practice? At the least you can visualize how each procedure happens. Do you own any gear? You don't need a training tower, go climb a tree. Rappel out of a barn. No victim?, use a 5 gallon bucket filled with water. There is no excuse not to know your knots and MA systems. You get my point. Time on rope matters and it's easy to tell who hasn't been on a rope much so get on a rope in those days before your test and do as much as you can. Also, team up with your classmates if you can and practice. They may have some gear you don't. Good luck!