Pulley Systems

Marginal Anchors | Anchor Considerations in Rope Rigging Systems Vol. 2

Marginal anchors in theory create a force out of many, but how should we present this diverse and sometimes controversial concept of anchor construction?  This is an introduction to multiple back-ties and projecting the power of substantial anchors to a single focal point. Marginal anchors are generally considered independent anchors points that would not support …

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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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Rock Exotica Omni-Blocks: Gear Vault, An RRG Signet Series Presentation | Block and Tackle

Rock Exotica’s Omni-Block swivel pulleys combine a swivel with a pulley in a patented design that saves vertical height and lets you remove and install the rope while keeping the pulley attached to the anchor. These patented devices revolutionized pulley use when they were introduced in 2005. The Omni-Block combines a pulley with a swivel …

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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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A Quick Pulley Comparison… They All Rock!

Hey all, I wanted to give a quick run down of some niche comparisons.  Most pulley manufactures today make amazing gear.  When I say most, I mean those within the centric conformity of  standards, safety and accountability.  We’ll be looking at CMC, Rock Exotica, and Petzl … and then, only a niched down subset of …

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Using the Fast Fours for Confined Space Rescue and Fallen Worker Rescue/Recovery: RLA Partner RopeLab

What has happened… a worker has fallen from his working platform. The worker condition is good enough where he is able to assist in his own recovery and rescue. This video was developed over a span of time where Rich took to heart, the process of confined space rescue, fallen worker rescue and simply using …

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Litter Hauling Techniques: A Little A Goes a Long Way

I wanted to talk a bit about a tool that I know for a fact, not enough people are aware of.   The Jag System from Petzl.  I happened upon this quick tech tip from Petzl and noticed 4 people in the system. Does it or should it really take 4 people to do a raise/lower …

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