Pulleys & Mechanical Advantage

Staggered Anchors: Progression from 3:1 to 9:1 Simple Mechanical Advantage

  Excerpt from Knots & Pulleys in Rope Rigging Systems Vol. 1 Segment 7 In continuing with the discussion about pulley systems this video reviews the 5 rules of simple pulley systems before delving into the principles of a 3:1 MA, mechanical advantage, and compounding a 3:1 system to a 9:1 using staggered anchors for …

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The Gear Used In Artificial Highlines and Two Tension Rope Systems

Ultimate – the best achievable or imaginable of its kind. Can we have The Ultimate Gear List for anything?  Probably not, but we can put some thought into what that might look like. Before we get to the list, let us outline where this gear cache came from. In building this course with Jason Ilowite …

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PETZL MAESTRO features

The MAESTRO combines the abilities of a progress-capture pulley and a descender for effective hauling, releasing and lowering of the load. The AUTO-LOCK system locks the load automatically and returns the handle to the stop position.   Let’s start with a Petzl Maestro Overview! 1. Working principle The MAESTRO uses a pulley mounted on a …

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How To Calculate Mechanical Advantage

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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Pulley system efficiency tests with Petzl’s Maestro, I’d S, Pro Traxion and 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. 1. Efficiency depending on the device used at the head of the system. The force required to raise a 100 kg mass was tested under several configurations with different …

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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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5 Rules to Help Determine Simple & Compound Mechanical Advantage Systems

From Rigging Lab Academy Course Mechanical Advantage Theory There are three categories of mechanical advantages using pulleys: Simple, Compound, and Complex. Simple MA: A Simple MA consists of a pulley system that has a single haul connection between the load and the haul team. Compound MA: A Compound MA is a simple mechanical advantage system pulling on the haul line …

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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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Want To Be A Dirtbag?

I’ve had a lot of bad ideas so I get pretty excited when I have a good one.  The Crackerjack Group recently held a “flyer” of a class we dubbed The Dirtbag Clinic..  and it worked. The idea came about because we had some friends in town for the Mountain Rescue Association Conference and they …

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The Petzl Jag System Has Become A Go To Tool For At Height Workers and Rescuers

As Torrey and I travel around the country filming and managing a very large amount of footage, it has become very apparent to me that one product has become, what I would call… an “emerging product”.  While in days past, the AZTEK was (and still is to some degree) the work horse for rigging systems… …

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