Login
Join Rigging Lab

Two Rope Tension System A-Frame Resultant Insight, Part 1

Written By: Lance Piatt

Let’s review some of the basic concepts starting with a term you’re going to hear a whole bunch: resultant. Resultant is a very important term when you work with a high directional.

Defining a resultant is what determines if your high directional is going to be stable or not. So when we say resultant, the full term is a resultant vector. A vector is a measure of force and direction. Here, we’re talking about resultants through the head pulleys. This is what’s giving compression and pulling down on our frame making it stable, so we know that force in and out of a pulley is going to be the same on either side.

We don’t need to worry about the magnitude or the amount of force in our resultant, we just worry about direction. We want the direction — that resulting vector — adding these two forces together to fall somewhere within the footprint of our frame or our pod. This keeps this compression pulling down and stable. In any system with just a single pulley through the head, we can always visualize that the resultant is this line through the center of the pulley.

You’ll notice with the setup we have in the next video, if we were to step back, we would see that the two resultants are coming down and landing almost directly in the middle of our frame. That’s what keeps it stable. One of the more common ways it changes is when we use this for an edge transition; we have an attendant out there, the attendant steps back and up, they move these lines up, and that resultant swings forward towards the front.

5 Day Advance Workshop - Rigging Lab Academy

We’re always going to have some movement, but one of the ways we manage that movement and keep everything in compression and anchored to the ground is by adding tension with a guying system. The guying system we’re using is three points and is more or less equally divided around our frame, which is optimal. On a 360-degree circle, optimal is 120 degrees between each one.

We’ve used a Petzl Jag which is a set of 4s and an overall really really simple system. When you pull on it, it adds tension. On the other side, we’re using what’s called a voodoo or a transport hitch. This is just a self-adjusting tensioning system. On the back side, we used a very common non-working 3:1 and dog tied it off.

We say it’s non-working because, at this point, we can’t pull on it, we can’t add tension, we have to untie it, and it doesn’t have any pulleys in it. It’s a very simple system but we want that friction that it offers us. We’re going to pull on it once, tighten it, leave it, and that’s the version of the non-working part. It’s still a 3:1 and would still function if we pulled it apart.

So there you have it! Three different guying systems that provide different ways of guying the opposing tension on the frame. They are all counteracting the compression and are designed so that the four vectors end up with a resultant falling right in the middle of our frame. That defines our stability here and later on in this course, we’ll move to a monopod or a gin pole. The difference there is when we don’t have the back leg, we don’t have that area to work with and our resultant needs to fall closer to the single pull.

If we had a tripod, this would open up a little bit wider and we’d have a big footprint in the middle for our resultant to land in. Just remember that a resultant needs to land within the space defined by our frame. If we have two legs, it needs to be in the middle.

Gear & Equipment We’re Using:

[thrive_lead_lock id=’51985′]Hidden Content[/thrive_lead_lock]

 

Peace on your Days

Lance
Categories

About The Author:

Picture of Lance Piatt

Lance Piatt

Beginning his career in the rescue and rigging world as a “blue collar” SAR member with Deschutes and Jefferson County teams. Lance Piatt owns and operates Red Ibex Solutions, a sales and marketing wheelhouse blending rope rigging education and exquisite imagery with equipment knowledge and understanding; housing Rigging Lab Academy and Rescue Response Gear… Lance is producing high-end video education, working with several experts and instructors to produce unique series of “how to videos” and courses for rope rigging: Such as; the first ever full-length rescue training DVD, 'Tower Rescue', released in fall of 2005. As well as a series of scenario-based rescues ranging from cave rescue to cliff rescue.

20 thoughts on “Two Rope Tension System A-Frame Resultant Insight, Part 1”

  1. 솔루션제작

    744624 953792Hi there! I basically want to give a huge thumbs up for the great data you could have appropriate here on this post. I will likely be coming again to your weblog for a lot more soon. 513606

  2. buy dumps good balance

    765795 988631I typically cant find it in me to care enough to leaves a comment for articles on the internet but this was truly pretty great, thanks and maintain it up, Ill check back once again 949379

  4. Condor CBD supplements

    947144 608705I merely should let you know which you have written an outstanding and distinctive article that I really enjoyed reading. Im fascinated by how properly you laid out your material and presented your views. Thank you. 682255

  5. sbo

    717295 483567Spot on with this write-up, I should say i believe this excellent web site needs a lot much more consideration. Ill probably be once once again to learn an excellent deal much more, numerous thanks that information. 781991

  6. zeadelbakry

    يعتبر الكيتو دايت من اهم واشهر الانظمه في العالم فهو يعمل علي انقاص الوزن بشكل فعال بمرور الوقت القليل يشعر جسمك بتحسن واداء افضل فهو يعمل علي تناول كميه عاليه من الدهون والبروتين ونسب قليله جدا من الكارب هيدرات ولا تتعدى الـ 5% من الاستهلاك اليومي للشخص

    https://www.zsporte.com/2022/04/blog-post.html

  9. dittery

    Cialis 20mg tablets are available in bottles of 10 NDC 21695-029-10 Cialis 20mg tablets are available in bottles of 16 NDC 21695-029-16 Cialis 20mg tablets are available in bottles of 30 NDC 21695-029-30 cheapest cialis People were surprised to find that this was a completely smoke free new type of firework, the deflagration efficiency was medical name for cialis 27 times that of traditional fireworks, and there was no pollution at medical name for cialis all What is even more frightening is the price

  12. feryima

    The costs of prescription drugs, which are somewhat controlled by pharmacy benefit managers PBMs who negotiate prices for insurance companies, have been on the rise for more than ten years now, and many patients have struggled to afford their medications cialis 20mg price

Comments are closed.

Helpful Links

Courses