@@perryfire3006 I had my crew watching it while on shift last night. Some of them are taking a ropes class this coming week and wanted to get a head start with the theoretical stuff.
@@fern9234 Excellent. If they are going for their Rope Rescue Tech then you may want to check out some of my other videos such as conversions and knot passes. And knots of course.
so if you have 9T going to the load, does that mean its 9 times easier to pull the load if you pull on the tail? Also if you have too many T would the rope snap, or does this help the rope snap less?
In theory yes. But due to friction it will never be a perfect ratio. In general however, 1T of effort will produce roughly 9T of force at the load in that configuration. The trade-off (let's use feet for reference) is that you will have to pull 9 feet of rope at the input to raise your load 1 foot. Any rope will break if too much force is applied beyond its ratings. So if you create a MA greater than the strength of the rope then yes it is going to break. However, that would be an interesting experiment to see if a system (due to the amount of rope in the system) can carry a higher load compared to a simple one-to- one ratio. I mean, it's still going to break at some point (or slip) if overloaded but how much more? The channel Hownot2 could answer that question more definitively. That's not a simple question you've asked me and the only way to find out is to break some stuff, haha. My guess is that prusiks or rope grabs would slip first and then the rope would break at the knot at the load. Good question for which I don''t have a definitive answer.
@@perryfire3006 What's the difference in the it two T's? You start with a T from where the load is being pulled. Then further up you put a second T that's on the same side......why?
@@frnkjones40 Think of the input as only 1T that has to continue until it terminates. That never goes away but along the way this 1T compounds itself through the pulleys which you have to add together to get the final result. Each time the rope goes around a pulley, the input of that 1T has to be countered with another 1T on the opposite side which creates an equilibrium of forces on that pulley. Thus you get a final force of 2T that the pulley creates. The rope grab is another force multiplier which can increase this input force but remember that the input force has to equal the output force. Hopefully too you can visualize how much force is being applied to your anchor in these configurations. Sometimes we focus so much on the final output that we don't consider what our system is doing to whatever is holding our MA system.
@@SooperToober Not quite sure why explaining the physics behind MA would upset anyone but don't be mad😀, I've got 70 plus other videos that show hands-on skills including a whole playlist of setting up mechanical advantage systems. ruclips.net/video/J8sjvZUb_Oo/видео.html. Cheers
If it helps draw them out on a sheet of paper and then you can orient them as you see fit. But there is no correct "up" or "down" per se as you can have an anchor or load in different positions. Cheers
I was hoping the included photos would help but you have to have at least a basic understanding of what constitutes a MA in pulleys and rope. Do a little research and then come back to my video and see what happens.
This is by far the best explanation I've heard so far. Thank you so much
My goal was to make it understandable for everyone. Thanks so much.
@@perryfire3006 I had my crew watching it while on shift last night. Some of them are taking a ropes class this coming week and wanted to get a head start with the theoretical stuff.
@@fern9234 Excellent. If they are going for their Rope Rescue Tech then you may want to check out some of my other videos such as conversions and knot passes. And knots of course.
One of the clearest explanations of MA on RUclips. Outstanding video.
Thanks!
Thank You!!
I have gotten lost on other explanations of 50,000 words or more. This was good.
Cool, happy it clicked for you. Cheers
This is great, please could you do a 7:1? I can't find a video anywhere!
Sure. Just give me some time as I am currently quite busy.
so if you have 9T going to the load, does that mean its 9 times easier to pull the load if you pull on the tail?
Also if you have too many T would the rope snap, or does this help the rope snap less?
In theory yes. But due to friction it will never be a perfect ratio. In general however, 1T of effort will produce roughly 9T of force at the load in that configuration. The trade-off (let's use feet for reference) is that you will have to pull 9 feet of rope at the input to raise your load 1 foot.
Any rope will break if too much force is applied beyond its ratings. So if you create a MA greater than the strength of the rope then yes it is going to break. However, that would be an interesting experiment to see if a system (due to the amount of rope in the system) can carry a higher load compared to a simple one-to- one ratio. I mean, it's still going to break at some point (or slip) if overloaded but how much more? The channel Hownot2 could answer that question more definitively. That's not a simple question you've asked me and the only way to find out is to break some stuff, haha. My guess is that prusiks or rope grabs would slip first and then the rope would break at the knot at the load. Good question for which I don''t have a definitive answer.
Wow
Thanks
Thank you for watching!
This here I can understand.
That was my goal. Thanks for watching.
I don't understand why it's necessary to put 2 t's on the same side of the rope on the input and output sides
Around the pulley? If so, it's because the tensions have to equalize each other.
@@perryfire3006 What's the difference in the it two T's? You start with a T from where the load is being pulled. Then further up you put a second T that's on the same side......why?
@@frnkjones40 Think of the input as only 1T that has to continue until it terminates. That never goes away but along the way this 1T compounds itself through the pulleys which you have to add together to get the final result. Each time the rope goes around a pulley, the input of that 1T has to be countered with another 1T on the opposite side which creates an equilibrium of forces on that pulley. Thus you get a final force of 2T that the pulley creates. The rope grab is another force multiplier which can increase this input force but remember that the input force has to equal the output force.
Hopefully too you can visualize how much force is being applied to your anchor in these configurations. Sometimes we focus so much on the final output that we don't consider what our system is doing to whatever is holding our MA system.
You are right sir. Physics. It's not just for breakfast, anymore!
*didn’t
IF your into physics and math, great, IF your here to learn how to use rope/pulley's GO ELSEWHERE, to much technical mumbling to stay tuned in
Try some of my other videos. You might be surprised. Cheers
I’m tee’d off too - will give you a second chance with your other video
@@SooperToober Not quite sure why explaining the physics behind MA would upset anyone but don't be mad😀, I've got 70 plus other videos that show hands-on skills including a whole playlist of setting up mechanical advantage systems. ruclips.net/video/J8sjvZUb_Oo/видео.html. Cheers
I guess it is my dyslexia but this confusing to me because your drawing are up side down
If it helps draw them out on a sheet of paper and then you can orient them as you see fit. But there is no correct "up" or "down" per se as you can have an anchor or load in different positions. Cheers
Unfortunately for those who have no clue, this don’t help fyi
I was hoping the included photos would help but you have to have at least a basic understanding of what constitutes a MA in pulleys and rope. Do a little research and then come back to my video and see what happens.