Predict the pull

If it's a 125:1 system then it should be something like 25 * 125 * .85 = 2,656.25 kg
This is saying that the overall efficiency of the 125:1 system is 85%, NOT that the efficiency of each of the three stages is 85%.

If each 5:1 stage was 94.7% efficient, then cascading 3 of them together would yield a 125:1 system that is 85% efficient overall.

If each 5:1 stage was 85% efficient, then cascading 3 of them together would yield an 125:1 system that is 61% efficient.

Edit: "cascading" = "piggybacking" = the output of one stage is the input of the next stage.

If you simply multiplied by 3 (i.e., 25kg × 0.85 × 5:1 × 3), that corresponds to an architecture of three complete 5:1 systems in parallel, with their inputs connected to a single output (load) and their input legs all connected to three separate 25kg weights, or...

(25kg × 0.85 × 5:1) + (25kg × 0.85 × 5:1) + (25kg × 0.85 × 5:1) = 318.75kg
20230411_103836.jpg
(These are not piggybacked)
 
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his is saying that the overall efficiency of the 125:1 system is 85%
Yeah - this is a good point. Do you aggregate losses or does the system as a whole act as the least efficient component?
If each 5:1 stage was 85% efficient, then cascading 3 of them together would yield an 125:1 system that is 61% efficient.
that makes sense to me...and I think is what the AI was doing...you lose efficiency as you add systems (which as you point out is not how I calculated my first part)...so you calculate the 2nd stage at 85% on top of the loss of in the first stage.

Non piggybacked:
If you simply multiplied by 3 (i.e., 25kg × 0.85 × 5:1 × 3), that corresponds to an architecture of three complete 5:1 systems in parallel,
yeah - that's what I did here:
25kg getting applied on the 3 inputs - don't know - but seems it would be something less than this - possibly the linear multiple of 3 x 5:1's = 106.25 x 3 = 318.75kg (702.21 lbs / 3.12 kN). Depends on how it's all hooked up to the load and the input / outputs work.

I thought what buggs was saying is that he's applying the 25kg at each point, and not piggybacking. I really want to see that setup IRL...I'm having trouble visualizing how you put 25kg at each input in a piggybacked (i think the term is compound complex) system.
 
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Yeah - this is a good point. Do you aggregate losses or does the system as a whole act as the least efficient component?

that makes sense to me...and I think is what the AI was doing...you lose efficiency as you add systems (which as you point out is not how I calculated my first part)...so you calculate the 2nd stage at 85% on top of the loss of in the first stage.

Non piggybacked:

yeah - that's what I did here:


I thought what buggs was saying is that he's applying the 25kg at each point, and not piggybacking. I really want to see that setup IRL...
He's definitely cascading/piggybacking them, since not only does he say "5:1 on a 5:1 on a 5:1 on a 5:1..." and not "5:1 with a 5:1 with a 5:1..." And to confirm this, the ideal output MA for 6 cascaded/piggybacked 5:1's is indeed 15,625:1, as he noted. Six parallel 5:1's would end up being 30:1.

The exponential growth in forces along the string of piggybacked 5:1's is also why he decided to cut it down to 3 systems instead of 6.
 
I'm having trouble visualizing how you put 25kg at each input in a piggybacked (i think the term is compound) system.
Are you referring to this?
If I connect them in series, i.e. I take the first one and input 50 kg (110 lb), then connect another one to the first one and input 50 kg, and on and on, until I connect the last one and input a final 50 kg, what's your prediction for the final output pull?

I think he was just saying that he's consistently applying 50kg to the input leg of the entire cascaded system as he subsequently adds stages.
 
Are you referring to this?
Yes...

He's definitely cascading/piggybacking
Yes - that's what I understood, but the 50kg at each input is what has been throwing me.

I think he was just saying that he's consistently applying 50kg to the input leg of the entire cascaded system as he subsequently adds stages.
That makes total sense to me - which means the input force is 50kg (or 25kg in the 125:1 system). Perhaps it's a misunderstanding (on my part) of the detail in how he's doing the setup of the systems and not relevant to the output force of the system. (y)
 
Yes...


Yes - that's what I understood, but the 50kg at each input is what has been throwing me.


That makes total sense to me - which means the input force is 50kg (or 25kg in the 125:1 system). Perhaps it's a misunderstanding (on my part) of the detail in how he's doing the setup of the systems and not relevant to the output force of the system. (y)
I'll letcha hold a dollar if what he was originally envisioning is not like this (except 3 cascaded systems instead of 6)...
1681234671899.png

Each system is a 5:1 and is connected to an anchor. All of them could possibly be connected to a rigging plate which is then connected to an anchor, or something along those lines. But, whatever the case, each one's input comes from the stage before, and each one's output goes to the next stage's input. Fin = 25kg.
 
updating with 0.614 % (compounded losses)

25 * 125 * .614 = 1918.75kg ( 4231.3 lbs / 18.81 kN )
100%. Agree. From post #52:
1681237579589.png

output mass = (input mass) × (effective MA)
(input mass) × (MA_ideal × efficiency)​

[[[25kg × [5:1 × 0.85]] × [5:1 × 0.85]] × [5:1 × 0.85]] = 25kg × [5:1 × 0.85]^3 = 1919.1kg
 
It is wild how convincing it could be based on how it presents its results, if you didn't look closely at the numbers.
Yes - I sent them some feedback to better train the AI on pulley systems :) ...there were a few cases where it literally could not multiply 3 numbers correctly. To be fair, it's still in testing, and they know there are all kinds of problems with it. There are some areas it's really, really scary good - this is not one of them. Will try again in the future.
 
Fighting stretch factor also, would look for compounding frictions to seize against the high power potentials shown.
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There is another build pattern to compound quicker exchange of velocity for power (root concept).
By not just serially, simple 'daisy chain' to add another system at end with own or shared anchor pivot connection as machine pivot to give greater power output from input.
>>this exerts force to system from outside system, of E&O portion forces to this anchor.
INSTEAD 'inset' the 2nd system at most reactive points inside outer/primary system that MUST have own anchor to exert E&O portion against.
>>all later systems do not need own or shared anchor to exert /waste E&O portion to
>>if simply fold it back into the system so not only usual output but usual anchor forces ALSO are inputs to next system.
Different_ways_of_handing_a_pulley_system_to_get_different_outputs.png

i unravelled this jewel from sitting so long in our DdRT,
where likewise pull on control leg, that also then must lighten you as load to exert the pull, using effort and E&O against load.
This can quote 2x potential (-friction) in DdRT. At first learned to run backwards to use weight +2x (sometimes dynamic) effort to lift(rescue etc.) or pretighten, then extended to pulley systems. Also note if just a 5x jig output pulls 4x on anchor/machine point. But, if pull correctly get 8x potentials output and anchor as 'closed'(circle)system from the effort then get standard 5x and 4x from bodyweight! Then if inset inside another system get 2 8x inputs to next system rather than 1 5x.
Very easy to doubt, then break something when try.
.
Pulleys being rolling levers sifted principle out to use in standard rigid levers confidently, whenever can get on both sides of pivot to give standard input and capture/conserve to return it's E&O direction back into system. That is just effort part, then add bodyweight to may advantaged side against target work.

SaveForces_4.png

Sorry to bend those fine numbers so!
This concept, arc frictions, sweat/swig and Tapered Hinge are some of most powerful and overlooked hide in plain sight things have found on our playground.

I did find some similars wondered about when researching : olds-cool Spanish Burton's, but my same theories apply there as well, and same weakness of reduced travel in trade.
 
It's gonna take me a minute to unpack all that...but I think I get the general gist... I ran across this paper when I was doing some research and I think it's getting at some of the same stuff having to do with angles and different ways of connecting the systems.
 
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Here's a mix mash of stuff to think on.

The I'm Still Up Pulley System Mechanical Advantage Corollary
Take a 4 or 5:1 system with 4 rotating pulleys, 2 at each end where the rope does a 180 turn.
Now add: W47 big blue rollgliss kit pulley, bronze bushing, 1.97" groove dia x 0.58" wide groove x 0.19" deep groove, tension ratio 1.20 equivalent mu 0.06 - typical of such used pulley.

Donzelli was prompted into some analysis perhaps by:
"If the block were frictionless, and both parts of line were parallel and directed vertically, a balance of forces predicts the reaction force at the block to be twice the line pull measured at the base of the tree. In 3 trials, the reaction force exceeded twice the line pull by 7.5%, 10.5%, and 9.3%."

So I did some ciphering to convert this to a tension ratio:
logT/baseT = (1.1x2 - 1) = 2.2 - 1 = 1.2 !!!!!!!!
Holy crap he got the same tension ratio as my W47 blue pulley. At least it's a vote for nominal consistency amongst typical pulleys. I'd take it to the bank as a rule of thumb. His impending motion hanging weights tests corroborated the about 20% difference in tensions except for one block that was probably better that had about 10% or a 1.10 ratio.


The You can't Always Get What You Want, But If You Try Sometimes, You Get What You Need Mechanical Advantage Corollary
An earlier post worked through the losses of a typical aborist rope doing 180 degree U turns through typical pulleys in a mechanical advantage rope and pulleys system. The simple tension ratio gives the rope tension loss per bend but adding up the losses for each configuration lead to the question of whether there was a limit of gains by using yet more pulleys.

The addition of tensions is done with reduced rope tension each time, so the tension ratio of 1.2 is used inverted 1/1.2=0.83

1 + 0.83 + 0.83 squared + 0.83 cubed + 0.83 to the fourth power + ... is the list of tensions at each leg of rope. This is actually the proportion of the initial rope pull, e.g. 100 lbs, 83 lbs etc if you initially pulled with 100 lbs.

such a sum of ratio numbers in a series is called the sum of a geometric series with ratio r between its terms. There's a formula to add up n terms.

ok here goes. 1/ 1.2 = 0.83 the ratio r

sum of the series = term1 x (1-r to the n) / (1-r)

n = 6 pulleys term1 is hand pull on rope so
(1 - .83 to the 6th) / (1 - .83) = (1 - .327) / (.17) = .573 / .17 = 3.37

so the hand pull diminished by 6 pulleys but adding up all 6 attempted tension gains gives 3.37:1 actual mechanical advantage. Moral of the story - use good bigger pulleys on your fat rigging line!

try r = 1 / 1.1 = 0.91
(1 - .91 to the 6th) / (1 - .91) = (1 - .568) / (.09) = .432 / .09 = 4.8 significantly closer to 6:1

real rope on a real pulley unfortunately is the 1.2 tension ratio. doh! maybe smaller amsteel on a 4" pulley would give 1.1 tension ratio. For extra points do it with rope on biner friction. fail.

So the geometric sum formula predicts the limit as you add infinite pulleys. Just try the formula with a very big n value. (1-r to the n) becomes 1.0 with a big enough n exponent and makes the 1/(1-r) formula.

1/(1-r) gives 5.88:1 max advantage on 1.2 tension ratio rope/pulleys. 11.11:1 for 1.1 tension ratio rope/pulleys. That's even if you set up a 100:1 or more system!!! It's all because the rope tension diminishes each time it goes around yet another pulley and makes smaller and smaller contributions.



Now some fresh meat:
You get these results with consistent direction of motion of the rope. You're penalized with losses as you lift and you're blessed with helpful friction as you lower. In between is no man's land. Consider cranking on the input rope of a 5:1 but you overshoot and let it back in just a little bit. Now one, or more, pulleys changed direction of rotation. You've got to remember that there's rope stretch roughly proportional between each pulley to the local rope tension - which is different in each rope leg. And you can release a tiny bit of rope stretch before the onset of pulley rotation. So some pulleys might be in lift mode, some lowering and some static I'll call it, where each side rope tension could be equal (!) Equal tension could happen! Anyway, point being that rope sag, overshoot, manual technique all can completely determine a measured result. It can change without you changing it as the rope creeps.

Easiest concept to use is losses are multiplicative in a series system. If you overshoot each tensioning motion and then lock the rope off like the action of a rope grab or prussic, well, now you know what happens. So if you're real keen, figure out the technique to get a 5:1 to measure out at 5:1 - kind of like calibrating block and tackle "sitback".
 
Fighting stretch factor also, would look for compounding frictions to seize against the high power potentials shown.
.
There is another build pattern to compound quicker exchange of velocity for power (root concept).
By not just serially, simple 'daisy chain' to add another system at end with own or shared anchor pivot connection as machine pivot to give greater power output from input.
>>this exerts force to system from outside system, of E&O portion forces to this anchor.
INSTEAD 'inset' the 2nd system at most reactive points inside outer/primary system that MUST have own anchor to exert E&O portion against.
>>all later systems do not need own or shared anchor to exert /waste E&O portion to
>>if simply fold it back into the system so not only usual output but usual anchor forces ALSO are inputs to next system.
Different_ways_of_handing_a_pulley_system_to_get_different_outputs.png

i unravelled this jewel from sitting so long in our DdRT,
where likewise pull on control leg, that also then must lighten you as load to exert the pull, using effort and E&O against load.
This can quote 2x potential (-friction) in DdRT. At first learned to run backwards to use weight +2x (sometimes dynamic) effort to lift(rescue etc.) or pretighten, then extended to pulley systems. Also note if just a 5x jig output pulls 4x on anchor/machine point. But, if pull correctly get 8x potentials output and anchor as 'closed'(circle)system from the effort then get standard 5x and 4x from bodyweight! Then if inset inside another system get 2 8x inputs to next system rather than 1 5x.
Very easy to doubt, then break something when try.
.
Pulleys being rolling levers sifted principle out to use in standard rigid levers confidently, whenever can get on both sides of pivot to give standard input and capture/conserve to return it's E&O direction back into system. That is just effort part, then add bodyweight to may advantaged side against target work.

SaveForces_4.png

Sorry to bend those fine numbers so!
This concept, arc frictions, sweat/swig and Tapered Hinge are some of most powerful and overlooked hide in plain sight things have found on our playground.

I did find some similars wondered about when researching : olds-cool Spanish Burton's, but my same theories apply there as well, and same weakness of reduced travel in trade.
I gotta go through and see how it changes things exactly when the double pulley on the load side is also used as the anchor ("folding the anchor back in", as you say); I'm unsure why I didn't analyze this way to begin with, as this is how, of course, every one of my 5:1's are set up.

All about that swigging/sweating! <3 Saw that on one of @Muggs videos for the first time several years ago, actually!
 
In 3 trials, the reaction force exceeded twice the line pull by 7.5%, 10.5%, and 9.3%."
Man, I've tried, but I don't think I'm following. Some of the terminology is throwing me...

If this is saying that the measured output force was greater than twice the input, is that due to friction/nonideality helping? That is, if more than the nominal input force was applied temporarily, would the friction present in the pulleys aid in "retaining" more than 1x the input force on the side of the pulley opposite the input?
 
Of course in pretightening friction is foe, but friend in lowering thru same system (if enough load to pull clean and not hang/seize).
Likewise, friction at a pulley on linear pull is foe, but same friction can help capture a 'purchase' (of rope from the loaded to the unloaded banks) during a non-linear/crossways pull of swig/sweat.. and work thru the pulley legs etc.
Swig/sweat is typical crossways to force leverage input(capitalizing on sine) to device like wrench/not a support column aligned to force(capitalizing on cos so opposite end of spectrum /inverse to leverage angle). Typically pre-tighten rope(s)linearly/inline as much as possible 1st as a support column, then progress to sweat/swig crosswise at 'Samson Angle' across said column as input to now a less 'rubbery'/more rigid rope column segment as a lever to extrude greater /less rubbery leveraged response, then even more in subsequent sweat/swigs until load moves. Tighten cargo strap down tight as possible(can hold, pull thru and start drum empty for more leverage, but always lock off with 2 full turns on drum), then bend leg(s) some has similar effect as a science model, changes pull directions some tho. But once open eyes, can see/L-earn principles many places, even if just to re-enforce depth of the rules. Rope/flexibles class, bends these rules with 'rolling leverage' where typical rigid levers can't.
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Another usage note is when pulling say a 5x compression jig (see as 3 typical points of :1xInput, 4xAnchor, 5xOutput); and lock off by using the 1x input/tail around under the top pulley w/Half Hitches etc. is now a closed system and system has 4x on both ends, have lost a leg of input pull that would give the typical output a 5x. Just as if locked a parbuckle off to self/not anchor strains that section of rope more as deform to knot.
Also, in lowering thru these systems, the higher capacity system w/pulleys is at same time less elastic dampening capacity to same load. Statically is greater, but dynamically can expose this Achille's Heel. Can give system and all connections, anchor(s) included higher/less dampened impact to possibly blow out weakest point as a 'fuse' (to then limit loading to rest of system). This blown fuse can be tragic accident, or by design. But strength of system adjusted at weakest point ratio to it's loading/chain of events as strong as weakest link. "With great power comes great(er) responsibility"-Spiderman
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Found this old pic i made of 'the Burtons family' on this chase long ago. These have the concept of using the usual anchor point of a secondary pulley system to input as thread has been talking about, but then also the usage of the usual anchor point of the secondary pulley system to also work against load, not dead-end to an anchor. Note how the simplest form gives 3x w/o complication of pulley on load. The rest kinda build on a Z/Trucker's.
Olde_compound_rig_styles.png

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On my chase, i could only find 1 other clear pulley representation to what i try to show on insetting a secondary system(s), inside another compression jig on old ship from ye venerable olde "Marlinspike Sailor" by Mr. Hervey Garrett Smith. Soon saw concept as like a martial arts move type logisitc of folding system in on itself for more output (as Orient seems to also do in philosophies and Chinese Windlass precursor to differentials) as really all these system still must follow same rules, even around counter-intuitive curves; re-affirming all the while the massive depth of the same principles to even more confidently follow.
Marlinspike_ Sailor-conservation-of-forces.png
Blue arrow is typical input, but then can hang on it and pull up at blue circle, or hold blue circle solid and make foot loop at arrow to input effort of leg force that would show then E&O of leg force at secondary input of blue circle.... then add the bodyweight also as an input.... and BOOM we be breaking chit! These forces can stand against efforts as foe like frictions, but tapped purposefully hard in correct direction, can be GIANT friend instead of foe!



Another kinda counter-intuitive application for figuring loads on stress and also using them later(can't find that pic, but thee late Brion Toss ran it as a contest 2months in a row from his yacht riggers newsletter(?) (and i don't remember anyone but him got it right off)some time after his Mr. Knot lessons on pbs sailing series.
Bent line load.JPG
i called the 2 xTension arc on load/thru pulley(400#) as 'mayhem effect' partially for how much stress on ISA bbs(bulletin board service), and across the arbo forums spawned from ISA going dark. Then L-earned to turn this pic sideways in a rig for extra turn-torque force sideways(w/o pulley) for some great rigging breakthrus on the fly, with same tools as always; now making bigger difference. The rules are consistent and impartial, can stack them on y/our side instead of against. Rope is great tool, mind even greater tho.
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All these things i sifted from the principle of working self in DdRT (as a feel for this), then expanded back out from there.
Ours is amazing and raw work, these are some of the jewels found on journey, truly greater than any target destination could envision.
 
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Super interesting! I've been having AI summarize the text for me to help my comprehension...(it does a good job at this) for example - I didn't know what a Sampson angle was...so here's AI after it read thru the text...

me> in the "Rope Sag, Overshoot, Manual Technique" Corollary, one of the key points is that losses are multiplicative, while gains are additive. Explain that in more detail.

AI> In mechanical engineering, it is generally accepted that losses are multiplicative and gains are additive. This is because in mechanical systems, losses (such as friction) act on each component individually, leading to a cumulative effect that is proportional to the number of components in the system. In contrast, gains (such as forces or torques applied to the system) act on the system as a whole, leading to a cumulative effect that is proportional to the total amount of gain applied. This is known as the principle of superposition, which is a fundamental concept in mechanical engineering.

me>what is a sampson angle?

AI>The "Samson Angle" is a term used in rigging and refers to the optimal angle at which to pull a rope in order to maximize the force applied to the load being lifted. It is based on the principle of leverage and the angle that provides the greatest mechanical advantage. The exact angle can vary depending on the specific rigging setup and factors such as the type of pulleys and ropes being used, the weight of the load, and the distance it needs to be lifted.

me>where does that name come from?

AI>The name "Samson angle" comes from the biblical figure Samson, who was known for his great strength. The term is often used in the context of rope and pulley systems, where the angle between the rope and the load is important for calculating the mechanical advantage of the system. The term "Samson angle" is likely a reference to the strength and leverage associated with the biblical character, and the idea that maximizing the angle between the rope and load can increase the leverage and mechanical advantage of a pulley system.

me>What is sweat/swig referring to?

AI>In the context of the text you provided earlier, "sweat/swig" refers to a non-linear or crossways pull that capitalizes on the sine of the angle to create force leverage input. This can be used to extrude greater or less rubbery leveraged response, especially when pre-tightening the ropes linearly/inline as much as possible first as a support column, then progressing to sweat/swig crosswise at the Sampson Angle across said column as input to now a less 'rubbery'/more rigid rope column segment as a lever. The term "sweat/swig" appears to be a technical term used in the author's field, but its exact meaning may vary depending on context.


:estudioso: Starting to make some sense to me now...
 
Note in Samson model, the player needed an equal and opposite against(so used other column)
and attacked the mighty target column of cos1(bearing massive weight properly of roof inline downward column)across at it's Achille's Heel of cos0 perpendicular to column as greatest leveraged angle. i stay with the Greco/Roman mythology imagery and 'simple' geometries of the time like simple kid stories as a fascination what Ancients tried to lend and the deep simple level to try to understand and pass it on at.
sweatingToss-Adkins.JPG
(note subtlety of swiggers leveraging, then also kinda quickly serving to snatch of tailerman downward too at right time)
in rope usage and heritage, tailerman /tender is very important in capstan cranking as well.
Mr. Ashley in ABoK gives sailor's verb of 'purchase' that see scant references to from others.
Usually we use 1 rope for leverage, and then capture a purchase thru the friction buffer quickly moving with 1 line for both operations.
This(below) gives view of separating the functions to 2 ropes for more of a cleaner ratcheting/less herky jerky system once orchestrated:
(note sling lower on tree where might have tried pulling thru pulley first?/for same task)
Rigid levers can only capitalize on sine(forces across column), and greatest when at sine1/cos0 perpendicular force across device on minimal axis leaving maximum axis as cross axis availing to most leverage against (so can invoke length multiplier).
vs.
column use along maximum axis cos1 only availing minimal axis to side forces/if any.*
True column w/o side force carries CoG same at 10' as 20' or 40'(no length multiplier on even rigid cos axis)
>>to cross force tho that gives leverage of tiltability vs stability of base width so martial arts fighter squats lower and wider(like pyramid) to stabilize against cross axis hit best type model.
Taking massive low weight off tree raises CoG w/o widening base by contrast; and is probably loose on it's pulls of weight distribution where was more tightly stabilized before (in)human treatments.. Am trying to show this as all the same, that we individually already know, at least pieces to, and how they come together to same picture have always known..for can be a lot of forehead slapping w/telltale palm print left as things start clicking, but of c(o)urse it is only logical that....geeeeez..
.
Ropes are allowed to also swap velocity for power inline(!) capitalizing on cosine, but yes in segmented lengths/additive, multiplier comes in still only on cross axis in swig*, or stacking/daisy chaining or here even more conservation of force by insetting/compound pivots(?) to within system.
sine leverage across column includes length, not cosine force aligned to column/no distance consideration; extra length is just more reach for forces.
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It all is conservation of forces, no free rides; must work with what is there from input force volume (power x distance).
Insetting to me taps into also using the promised, but seemingly elusive E&O force also(other half of yin/yang too as magician's other sneaky hand), that is usually unwatched so as to be 'discarded'/dead-ended to anchor outside the system as a pivot machine as like see-saw. Compounding this into the system as a secondary input, rather than 'throw away' is model. Also gives 2 components: effort(and it's E&O) as 1 and then bodyweight. System only needs 1 external machine pivot/'ground'.
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In normal pulls exert effort to the limit of bodyweight;(unless pull on anchor for more, insetting puts that pull inside system too!!)
i always and all ways now play the chess game where i can to exert effort + it's E&O thru system on either side of pivot (E&O directions captured) then add bodyweight (instead of it being a limit of input alone). Then, work leg force in as effort when can, and can impact with weight and sometimes effort too, in tandem, or as bump to move and chaser, or either effort or bodyweight input holds system at bay while the other input type impacts.
This stuff is a game changer, and if can grasp it, rest from before is cake and rules even more so pervasively confirmed. Even if don't get, is probably right direction to try to reach to..
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Rigid cross axis vs. Flexible inline leverage classes in systems as same in many ways can see many parts of one thru the other if already familiar or just confirm; kinda it's own parity check as trying to model.

DIRECTION of force is a very much overlooked important item.
a class1 lever is the ONLY one that reverses Direction, classes 2&3 preserve direction as swap velocity (mph) for power(force) just like 10speed or transmission, can have high speed or granny hill climb from Zer0, not both. Thus all leverage exchange systems can be used also as like transmissions to negotiate speed if that is focus(use in reverse to gain power by swapping input/output). From an input force volume conservation in same amount of time at one end of lever (input or output) can have more distance covered(mph) vs. compressed to less distance of more force(slower mph). Dilute force to more distance or compress distance to more power, no free ride, in fact always some co$t of inefficiency/friction (or Kennedy bullet would still be flying theory).
Lever_classes_in_standard_rigid_levers%2C_as_applied_to_rope_%27rolling_levers%27.png

Several decades of extreme focus into this fascinating chase.


*
EXCEPTION: rope/flexibles class do NOT resist on the cross axis like rigids, so no distance multiplier
>>work instead by undermining the cosine trying to work, to then reveal sine to exploit, but no distance multiplier on cross axis input when go this route of tapping available forces.
>>there is still a non linear(not as additive power progression as pulley route noted) progression change for cos/sine change scale, but only for short range.
 
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