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How does a Compound Pulley Systems work 

The Rope Access Channel
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How to make a compound pulley system can be very simple.. Just put a simple on a simple.. See what I did there 😉. In this video we get into the three most used compound pulley systems. Of course there are countless variations possible. I will also demonstrate why using a compound pulley system may not be what you need.
The answers to last weeks quiz can be found on this post on www.theropeaccesschannel.com:
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Check out the first comment.
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Chapters
0:00 Intro
0:18 Recap Simple Pulley System
0:32 Drawing out a Compound Pulley System
2:30 Compound Pulley System
5:40 Switching the compound pulley system around
9:00 The DISADVANTAGES of a compound pulley system
16:00 Get VRigger with a DISCOUNT
17:15 Quiz time
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25 июн 2024

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Комментарии : 56   
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
What are your answers to the quiz? And why would you use the last system??
@benediktmayr3465
@benediktmayr3465 Год назад
Maybe I would want to use the last system if I have to lift something very carefully/slowly. This System would allow me to lift the load with only half the speed im pulling the rope.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
@@benediktmayr3465 Almost, sort of, not really though 😉 I will explain next week. Ok, just a hint Did you watch the video I pointed you to in the end? Does it look like we are trying to move someone slow?
@benediktmayr3465
@benediktmayr3465 Год назад
@@TheRopeAccessChannel Oh yeah right I didnt watch the video yet no but I just realised that i had the right thought but wrong assumption... It would be to move something fast! A normal setup already pulls things slowly and this one is the opposite.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
@@benediktmayr3465 👊🏻👊🏻😃 Correctemundo! Get something moving twice as fast! (for twice the input though)
@benediktmayr3465
@benediktmayr3465 Год назад
Here we go again! A) 15:1 (5*3:1) B) 3:1 It seems to be a 6 to one at first since you have 2*3:1 but if i see it correctly they dont add up but are just parallel to each other C) 0,5:1 The weight basically acts as its own pulley onto our system it becomes apparent after looking at it upside down.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
correct. I would call the last on a 1:2 but we mean the same thing. If you want the answers, check out the top comment on this post: bit.ly/3hM2Hai
@matiasgarcia886
@matiasgarcia886 Год назад
Hi, great and very well explained video I'd love to see this kind of format but instead explaining the GRIMP day techniques and manouvers. It would greatly help the rope rescue operators (and enthusiasts) of your channel. Thank you!
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Thank you 😀. I am getting to that. First we need to get some basic things out of the way. 1) Being able to move around on rope 2) Understand the gear involved 3) Understand the principles of rigging and the sometimes hidden dangers 4) What happens when we add pulleys and mechanical advantages 5) How to tension ropes. And some more things. It will take some time and by the time I am done I will have shown everything needed for a Grimpday team. I will get some outside help to accomplish that :-)
@shiotime.77
@shiotime.77 Год назад
Drawing A is a simple 3:1 MA (last pulley on the right is just a CD) acting on a simple 4:1 MA with separate system therefore 3x4 = 12:1 COMPOUND MA...Drawing B both systems are in simple 3:1 MA configuration, when you pull both ends the MA does NOT change at all...Drawing C is basically a 2:1 MA because the upper pulley is a simple 1:1 configuration that is mostly used to DEVIATE directional anchor system... I think it is also a BIG help if you could explain further the differences of SIMPLE, COMPOUND, and COMPLEX Mechanical Advantages...For sure, a lot of people in our rope community is still in CONFUSION state...Thanx Alex!...Way to go!..;)
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Thanks for participating! Answer B is correct, the other two however are not. Count the ropes again in question A. Question C: is a bit more complicated though. Have a good look and try to envision how fast the load moves in comparison to the pull. If it would be a 2:1 the load will move at half the speed. Is that really happening? If you want the answers, check out the top comment on this post: bit.ly/3hM2Hai I can explain further on Simple Compound and Complex but in each video so far I have mentioned when a system is what. Also in the upcoming Complex video. Maybe I should make a shorter one recapping everything and tying it together. That might be a good idea. Thank you
@EricNietofilms
@EricNietofilms Год назад
A = 15:1 B = looks like a 3:1 (if 1 person it's pulling from both systems) C = 1:2 used for making the speed double. Nice videos, and I like you making us breaking our heads on this quiz!
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Thanks for that!😀😀😀
@technoheld1989
@technoheld1989 Год назад
A 15 : 1--- B 6 :1 --- C 1 : 1 Hello and thank you for these interesting videos. I really thought long and hard about System C. Likely loss of Mechanical Advantage. Only 0,5 : 1. I'm looking forward to the result.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Almost. A is right, B wrong, and C nice correction! It is a Mechanical DISadvantage ;-) If you want the answers, check out the top comment on this post: bit.ly/3hM2Hai
@balhatchet
@balhatchet Год назад
A: 15:1 B: 3:1 C: 0.5:1 - sometimes called a reverse 2:1 (you could use this if you wanted to raise your load twice as fast as you're pulling, stunts would be a good situation for it)
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Exactly! spot on! Thats why I pointed to the stuntvideo in the end 😉😉😉
@340wbymag
@340wbymag Год назад
I am in love with pulley systems. For some stupid reason I cannot explain, they just fascinate me. I have for fun and my own personal education constructed ratios up to 550;1. That would be a 15:1 pulling on another 15:1 being pulled by a 2:1 system. That's when I ran out of pulleys. Imagine all the climbing gear you could break with a system like that, but if it held together, you could lift a mountain. As to why you might use a complicated system, the answer is easy. It's easier to use the right pulley system to move a heavy load. I am a small old man, but with my pulleys and ropes I can move and lift game when I hunt. Imagine a puny little guy like me dragging an elk up a mountainside to my truck after a successful hunt. Imagine me attempting to perform a rescue and having to raise or lower a victim without pulleys. Pulleys are worth their weight in gold. I will only answer the last question in your quiz so others can respond. C is a tricky question because it looks like a 2:1 system, but is instead a .5:1 ratio, meaning you'd have to lift with twice as much force (200) to lift the load. That's a good question!
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
🤯550:1!! I though I was weird making an 81:1 to test things. We actually ripped the sheath of the rope then..... 😂😂😂. According to legends, pulleys and levers are what build the pyramids😉. Ingenious systems! Question C) is correct. You would need twice the force. What happens with the speed?
@340wbymag
@340wbymag Год назад
@@TheRopeAccessChannel You double the speed of the pull.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
@@340wbymag exactly so if you would want someone to move fast and far that would be the way. You just need more input😜
@340wbymag
@340wbymag Год назад
@@TheRopeAccessChannel Correct me if I am wrong, but I believe this configuration (C) would increase to load upon the uppermost pulley to 400 pounds (or kilos).
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
@@340wbymag that is correct 👍🏼
@EricTheDane
@EricTheDane 2 месяца назад
Green box is also a 3:1 (same as red box). Both are 9:1.
@TheRopeAccessChannel
@TheRopeAccessChannel Месяц назад
Answers are on the website. Link should be in the description.
@ralphm5273
@ralphm5273 Год назад
A: 15:1 B: 3:1 C: 1:2 Would have been great if my physics teacher back in the days would explain it as interesting as you do. keep it up. 👏🏼
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Thanks for that! Correct answers by the way. Can you think of something where you would use C?
@ralphm5273
@ralphm5273 Год назад
@@TheRopeAccessChannel this would be used for cases where lifting speed is more important than lifting weight.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
@@ralphm5273 exactly. Like we did in the stuntrigging video a few weeks ago. Move someone fast and far👍🏼
@nathanhead6140
@nathanhead6140 Год назад
A) 15:1 (5:1 x 3:1 w CD) B) 3:1 C)1:2 - Because the tension in a rope going through a pulley is equal on both sides, so that means that the pulley that is connected to the load is actually seeing 2 times the weight of the load. The second pulley is only a 1:1, so that results in a very inefficient 1:2 overall
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Well, inefficient depends on why you set that up 😉😉😉. What happens with the load if I pull with 1 m/s?
@brodobrey9009
@brodobrey9009 Год назад
A) 15:1 b) 8:1 c) 1:1 or 1:1,5 no have anvantage, c-it's interesting gueestion)
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Hi Bob, A) Correct B) Incorrect. I am curious how you got to 8:1 C) Almost got it 🙂. If you want the answers, check out the top comment on this post: bit.ly/3hM2Hai
@richskater
@richskater Год назад
A. 15:1 (3:1->5:1) B. 3:1 (w/ a backup😆) C. 1:2 (hoping for more of these, they are the hardest to figure out (when biggger) and there's not much on here about these types of systems)
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Correct. Complex systems can be tough to figure out. Most of those quizzes and puzzles I see online are more theoretical setups that no one would ever use. Just a fun thing to test your understanding on the T-Method. Let me say that no one in normal rope access. There might some niche spot where some exotic complex 7:1 might make sense and where the advantage outweighs all the disadvantages. Something like. mountainguide crevasse rescue setup. I use C) when we do stuntrigging and want to move something fast over a relatively short distance. Input could be something mechanical like a winch or a ram. Or just two guys holding on and jumping from a ladder haha
@serhiikushnir4945
@serhiikushnir4945 Год назад
a) 15:1 b) 3:1 c) 1:1
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Almost got it my friend. Answer a & b are right. C is different though. Answer will be on the website.
@caotropheus
@caotropheus Год назад
A 15:1 B 3:1 (eventhough there are two 3:1 systems, 3 metre pull only moves the load 1 metre) C 1:2
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Correct. good call on B! If you want the answers, check out the top comment on this post: bit.ly/3hM2Hai
@gallant_hung
@gallant_hung Год назад
1. 15:1 compound 2. 3:1 CD & 3:1 CD TTRS 3. 1:1 pulley for change direction of the 1:1 CD, use for low angle change to high angle, I guess😂
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Does system 2 make it feel lighter? With 3, if you pull down 1 meter, how far does the load move?
@KowalscyTeam
@KowalscyTeam Год назад
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
👋🏼
@FalenAnjel2
@FalenAnjel2 Год назад
A- (Blue rope is 3) (3 carries to black 5 time (3 on bothsides of the pully x2+ 6) so 6,6,1 =13 + the blue16:1 B- 6:2 ( 3:1 1 system 3:1 2nd system + 6:2) C- 1:1 ( I haven't seen or set a system like this up myself so I don't know). Since the "general rule" taught to me is when we're towards the load and not the anchor it counts to M:A anything towards the anchors (minus complex systems) won't contribute to your M:A and it's a deadline. If I am wrong is any of this please correct me with a work layout so I can figure out were I miscounted and learn from it.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Thank you for your comment. A) You are complicating it so much i dont even understand how you got to 16:1. If you watch the video again it should be clear. I don't understand how my explanation in the video could lead you to that. Help me learn here. First identify how many simple systems are working here, then identify which is pulling on which. Then it should be clear. B) I get what you are saying and the input can not be 2 if I say, "me as a single person pulls on the load". Then the input is always 1. Think about if the load will move at 6 times the speed or 3 times the speed (slower that is). That will tell you the MA. Or is the load going to move slower when we add the second system? C)That general rule is correct for simple systems and even compound ones. Actually also here.. If I have a load and one pulley at the anchor and pull down that would be a basic 1:1 with CD. But in this example I am not pulling on the load, I am pulling on a pulley. And another general rule is, if a pulley moves, it does something for the MA. Therefore it can not be a 1:1.
@martindan5680
@martindan5680 Год назад
A - 15:1 B - 3:1 C - 2:1
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Close one Martin. check out C) again. If I pull down, will the load be twice as light like with the other pulley systems?
@jackkuo1139
@jackkuo1139 Год назад
A: 4:1; B: 3:1; C: 2:1
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
You are on the right track. Check out A) again. it is not a 12:1 B) Trick question and you saw through it👍🏻 C) Incorrect. If you pull on the blue rope, does the load get lighter? I don't know what more to say on SIMPLE than what I said in the previous video? I also say that in the beginning here and at 9:00 I show the definition of COMPOUND. COMPLEX will come next week. I am creating this under the assumption that everyone who is interested watches all the video's on the subject. So maybe I will go and make a sort of recap video after the COMPLEX one to put them all in one place. Yes, I will do that. Thank you!
@rogernation2551
@rogernation2551 Год назад
If you have a 9-1 system ( two 3-1 systems), and add the same system. Would that be 81-1? It’s two 9-1 systems, so 9x9=81. I would use pulleys rather than prusiks. I’m pulling tree stumps and I want to overkill it…… by a lot.
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
3x3x3=27:1
@rogernation2551
@rogernation2551 Год назад
A complex 9:1 (3x3) stand alone system, but instead of connecting that to force, connect that to another 9:1 stand alone system. Then connect that to force. So that would be two separate 9:1 systems connected to my winch. Is that 9x9? Which would equal to 81. And I want to edit the statement about prusiks, I meant to say, “ I would use pulleys rather than carabiners with the prusiks
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
@@rogernation2551 now that makes more sense. Pulleys over biners any day! If you put a 9:1 to a 9:1 that would be 9x9 indeed
@rogernation2551
@rogernation2551 Год назад
Thank you for your confirmation. Kinda thought so, but I’ve only been doing this for a couple of years and still consider myself a novice. Which is cool, so much to learn
@infbajuk
@infbajuk Год назад
A 15:1 B: 3:1 C 1:2
@TheRopeAccessChannel
@TheRopeAccessChannel Год назад
Correct
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