Thanks to Peak Rescue Institute Full Video at the bottom! In general, the Ideal Mechanical Advantage (IMA) is the ratio between the distance the load moves and distances the haul team moves. In a 2:1 system the load will move 1′ to every 2′ of haul. However, this does not mean that lifting the load is twice […]
Mechanical Advantage, Part 1 Read More »
Thank you Peak Rescue Institute Let’s begin with manual hauls. When you talk about manual hauls or mechanical advantage, you have to talk about work. Work is done when force moves an object. Well, what’s this thing called force? Force is simply a push or pull that causes an action. And in fact, force can
Haul System Basics & Pulley Systems on Rope Read More »
Thanks goes out to Peak Rescue Institute. A two rope off system is essentially a system of two two rope systems that are working in a complementary fashion to move a load down one side of a gap across laterally or horizontally, across the bottom of a gap and then up the other side.
Quick Overview: Two Rope Offset Read More »
There can be a big difference between the theoretical efficiency of a pulley system and its actual efficiency. Here are test results from the Petzl lab. From Gear In Use 4: Rope Access and Confined Space 1. Efficiency depending on the device used at the head of the system. The force required to raise a
Pulley system efficiency tests with MAESTRO, I’D S, PRO TRAXION, ROLLCLIP… Read More »
CMC PROSWIVEL™ PULLEYS Strong, versatile, and ergonomic pulleys are at the foundation of efficient rope systems for rescue and work at height. Expanding on the original patented swivel pulley line by Rock Exotica, the CMC ProSwivel Pulleys are time-tested and brought to you by two companies committed to quality and service. Each pulley is certified
CMC PROSWIVEL™ PULLEYS Read More »
Excerpt from Gear In Use 2: Techncial Rescue All maneuvers must be done on two independent rope systems. These two systems can work in parallel (two haul lines) or separately (work rope and belay rope). Gear Within This Learning Lesson Petzl Maestro Petzl Jag System Petzl RollClip Petzl Rescucender 1. Examples of hauling with
Team Rescue Techniques For Hauling and Lowering Read More »
Mechanical Advantage Overview Mechanical Advantage is a measure of the force multiplication achieved by using a tool. In most cases, this involves using pulleys, but that isn’t always the case. The purpose is to show how we can achieve more work with less people AND that sometimes having more people can actually be dangerous. An
A Mechanical Advantage Overview Read More »
A mechanical advantage haul system reduces the effort required to raise a load. The mechanical advantage obtained is based on the pulley effect. 1. The Pulley Effect If we consider a load suspended on a rope, the rope passing through a pulley above the user, with the user’s hand holding the rope on the
How To Calculate Mechanical Advantage with Petzl Gear Read More »
Over the last year or so I have been trying to up my rigging game with the main focus being “rigging light, rigging quick, rigging solid and rigging efficient”. I will be the first to admit that all for all of this to happen at the same time it is a special day. I will
(This article was originally run in Firehouse October 1, 2019) Russell McCullar clarifies whether 15:1 is still relevant and says that fire departments should select gear and load limits that meet their needs. All Photos by Russell McCullar Not long ago, I was explaining to one of my students that our training agency was undergoing
Technical Rescue: The Importance of 15:1 Read More »
