Tree Rigging System Design: Moment, Angles, Load Sharing, X-Rings, etc

spectacles testicles wallet and watch [Music] hey what's up climber nation patrick here so a couple months ago i made a video about sort of the basics of forces in rigging uh in tree work and i called it part one and i just kind of left you guys hanging so i wanted to come back and clarify some things uh introduce some new ideas and just try to tie the whole thing together as an overall concept and that's really what i was going for so in the first video we covered forces and vectors resultant vectors static versus dynamic loading positive versus negative rigging shock load letting it run all that basic stuff if you haven't seen the first video make sure you check that out that's very important that's that's really fundamental stuff so first of all i wanted to clarify by what i meant when i talked about tension versus compression in that first video um i was aware that i wasn't using it properly but i didn't know a better way of explaining it so um after a lot of thinking about it and looking into it i've i think i have a better way of explaining it okay so um any time any if this is a stem of wood anytime that we are torquing it right this is technically called moment any torquing force um when you have that on the inside the fibers are being compressed so you have compression and then on the outside the fibers are being stretched so you have tension so tension and compression technically are always operating at the same time right you almost never have perfect compression which would be you know a straight lengthwise axial force along the stem of wood you almost never have that right um so really what i was trying to get at when i was talking about tension versus compression is you're you're always trying to uh to design your systems so that you are maximizing your uh your compression forces and you're minimizing your torquing forces okay that's what i was really trying to drive home now let's talk about the concept of moment now this is something that i've um i mean i've heard people talk about it before and i never fully understood it in the moment moment is is similar to bending they're not quite the same bending is if you had a piece which is affixed on both ends and you applied a perpendicular force in the middle that would be bending so moment is a force being applied at a distance from a point of rotation right so it's a torquing force so the easiest example would be when we're topping out a tree right so the moment is the uh the amount of force being applied which is really just the weight of the piece multiplied by the uh the distance from the point of rotation which is the cut to the center of mass of the top right that's the that's the simplest uh example of moment is taking a top and so obviously uh you know the uh and again like this is how we break trees we you know this is how we break ropes we take tops that are too big and which results in a moment force which is too much which snaps a stem right and really the only way to minimize the moment force is to take smaller pieces okay so moment again moment is a it's a torquing force acting acting at a distance from a point of rotation right so it's leverage you know what i mean it's leverage the further out that you apply a force the more the more leverage you have the more you're it's a force multiplier really is the way to think about it okay so here i'm using these little washers these are representing x-rings okay rigging rings you know i've said it before these things are absolutely amazing these are my favorite for rigging um a lot of people when the when when the concept of these comes up the question of these they they say uh you know rings are great because you can you can install them and retrieve them from the ground and uh and i'm always thinking yeah you can but in my mind that's not the point of rings at all the point of rings to me is they are small and light cheap you can splice them yourself but the point of rings is that you use them in quantity right you use them you have a bunch of rings and using them you can tie the tree together with your rope and you can you can route the rope in such a way that you can maximize the strength of the tree and and your rigging system okay so so for instance okay this the simplistic example here would be if this is my lead my leader on a tree a stem here and i want to use this as my rigging point right the simplest way to do it would be to just put the rope straight from the ground through that ring and and that would be the most basic rigging system it's also the weakest example because what you have here as soon as you apply a load what you're doing is you're you're torquing this entire stem it's a moment force right it's acting at a distance from a point of rotation which would be somewhere down here near the base of of the leader right in my mind that would be your point of rotation and your force is acting way out here at a distance okay and that's this is a very weak set up for a rigging system okay so one easy way to to increase the strength in this situation would be to put a ring down here near the base of of that lead and then take your rope on the way up you would install that ring and put the rope through it okay and then up top now when you put your rope through the rigging point now what you've done is you've changed the angles and you've increased the strength because now now you're pulling more on the entire stem as opposed to just the end okay if that makes sense and you could even you could probably increase it even more if you added a mid ring here in the middle um this would be what we what we call the fishing pole technique right um and that's again the concept is is to spread the load out and and to try and and pull on the the entire structure rather than just one piece of it right so that is that is a way using rings that you can route your ropes to maximize the strength of the system now an even stronger way would be if you had another stem like this one okay i put a ring here so what if i took my rope up through the base ring and then i took it through here and then i took it over to my rigging point okay like that if that was my system now what i've done is i've really changed these angles i've opened them up anytime you open up your rigging angles you decrease the the maximum force right the uh the maximum force is 180 degrees there's a chart um i'll try to find the chart that shows this but basically the highest amount of force is 180 degrees as you open those angles up the maximum forces decrease right so in this case you can see when i apply a load here on my on my terminal rigging point um you can see that it's really pulling on the entire tree as opposed to just one section or just one lead leader right so this would be a this is a really strong system and you can see again this angle is even more opened up than it was before this angle is nice and open right this is this is a strong rigging system okay so again really think about those angles and again this is where rings come in right i would never you know like back in the day you're not going to haul up you know three four big heavy rigging blocks to to change the angle or hopefully you're not gonna have to but with rings it's not a big deal they're small and light right and you you can have them you use them in quantity right so i i all the time i'll use two three four rings in the same tree it's no it's not a problem and again in quantity that's where rings really shine that to me is the point of rings is that you can you can route your ropes in such a way that you maximize the strength of the entire tree right and this is load sharing too right this is the concept of load sharing is what i'm what i'm trying to get at here is you know don't don't put all the load on just one little section of the tree try and spread it out try and think about about the compression versus the the torquing right that's the real concept i also had an analogy which i don't know if this will help but um it's similar to being carabiners right every carabiner they have these these strength markings and there's always a strong axis for a carabiner which is lengthwise they're always meant to be loaded lengthwise like this they're never meant to be loaded cross-loaded like this okay the cross loading is usually at least half the strength you lose half the strength by loading it this way as opposed to this way and that's that is how i think similar to how i think about wood stems you're trying to load them this way as opposed to this way whenever you can right so um i did want to recommend because you guys know i'm big on reading books i wanted to recommend a couple books here the first is the art and science of practical rigging this is like the og rigging book from back in the day this has been around for a long time this is still full of really good information i still highly recommend this book uh it's got a lot of good good illustrations and there's a lot of good concepts in here important stuff so i would start with this the art and science of practical rigging a good one and then the second one that i really like is the tcia book best practices for rigging in arbor culture this book is fantastic as well and this has a lot of great contributors and a lot of excellent illustrations again this book is amazing uh highly recommended so you know if you're if you're getting into this stuff definitely check out these two books and uh the real point that i'm trying to make here with with these two videos on rigging forces is you know just try and think of yourself as the architect of of a rigging system you're designing you you are the designer of a system don't just you know don't just get in the tree climb to the top and look around and be like uh okay i'm gonna rig off of here you know and just pull a rope up and you know just start working don't do that you know start from the ground really analyze analyze the tree in real time and think about think about where the strength is and think about how you would best design your system to tie everything together you know you want to work with the strength of the tree as opposed to tearing the tree apart if that makes sense right that's what i'm really trying to go go with that's the the point that i'm trying to make here really be deliberate try and be as deliberate as possible when you are when you're designing your rigging system and always try and start with the end in mind and again i've mentioned this before this is again something that i love about rings i actually love the fact that they're not midline attachable and the reason i say that is because it forces you to start with the end in mind it forces you to think about things at the beginning rather than the end you can't just add a ring into the middle of a rigging system while you can but it's a pain because they're not midline attachable so it forces you into that mindset of you know what would be the best way to do this and you can do it as you're climbing and as you're working and you can build a rigging system which really ties the tree together again instead of pulling it apart okay so that's that's what i'm trying to go for be deliberate be the architect of your system and uh yeah i hope that makes sense guys i hope you can get some value out of that and again make sure you check out the first video and uh until next time [Music] peace [Music] [Applause] you

Channel: EducatedClimber

Views: 17,187

Rating: 4.9522996 out of 5

Keywords: arborist, tree, work, climbing, chainsaw, rope, knots, ropes, knot, trees, arb, rigging, roping, educated climber, climbing arborist, srt, tree climbing, tree work, drt climbing, ddrt climbing, vectors, forces, rigging system

Id: h1WcTXPmxtI

Length: 14min 6sec (846 seconds)

Published: Sun Oct 18 2020