Mechanical Advantage

CMC PROSWIVEL™ PULLEYS

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 …

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Team Rescue Techniques For Hauling and Lowering

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 …

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Confined Space Rescue Split 4:1 Raise

Excerpt Taken From Rigging Lab Academy’s ~ Confined Space Rescue: Technician course Confined Space Rescue Split 4:1 Introduction With the introduction of Petzl Grillons, AZTEKs, and other small mechanical advantage devices, a lot of people don’t use a rig split 4:1 anymore. If you don’t have access to a Grillon or small mechanical advantage systems …

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Pulley system efficiency tests with MAESTRO, I’D S, PRO TRAXION, ROLLCLIP…

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 …

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How To Calculate Mechanical Advantage with Petzl Gear

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 …

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A Little Known Tool That Is Making Huge Headway… The Inside 9 Mechanical Advantage System

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 …

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Technical Rescue: The Importance of 15:1

(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 …

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The Differences and Similarities of the AZTEK Elite and Pocket Hauler

Meet The Players… The AZTEK Elite and the Pocket Hauler. Compact pulley systems have been in use for a long time, but the AZTEK in its current version is really what is known best. The original version (AZTEK Pro), is Sterling’s Pocket Hauler, includes these mini double pulleys and had a progress capture prusik at …

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Go 0 to 60 In Your Understanding of Mechanical Advantage

Determining mechanical advantage using the T-Method is really the guiding method to determine the “ideal mechanical advantage” or IMA.  However, note… this method doesn’t take into consideration the friction problems or coefficient of rope bending or turning on metal. So what is mechanical advantage? Mechanical Advantage Definition 1 “A force created through mechanical means including, …

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