Pulley Systems Archives | Page 3 of 10

Ascenders and Clamps Technical Tips: How to calculate mechanical advantage

By Lance Piatt / Blog, Petzl, Principles of Learning, Pulley Systems, Pulleys & Mechanical Advantage / 10 Comments

©Petzl Technical Information ©Petzl 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 …

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How To Calculate Mechanical Advantage with Petzl Gear

By Lance Piatt / Blog, Mainline Systems and Operations, Mechanical Advantage, Petzl, Pulley Systems, Pulleys & Mechanical Advantage / 38 Comments

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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CMC MPD ~ Two Rope Offset ~ TTRS

By Lance Piatt / Blog, CMC Rescue, Mainline Systems and Operations, Pulley Systems, RRG Gear Review / 114 Comments

CMC MPD ~ Two Rope Offset ~ TTRS The MPD allows you to go from lowering to raising without changing hardware. More than nine years of research and development went into the patented Multi-Purpose Device (MPD), which features major innovations in advanced technical hardware for rope rescue professionals. The MPD’s high-efficiency pulley, with an integral …

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

By Lance Piatt / Anchoring, Blog, General Rigging, Pulley Systems, Team Competencies / 335 Comments

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

By Lance Piatt / Anchoring, Personal Competencies, Pulley Systems, Pulleys & Mechanical Advantage / 219 Comments

Excerpt from Knots & Pulleys in Rope Rigging Systems Vol. 1 Segment 7 Let’s continue with our discussion on pulley systems. We can look at what we have right here. You can see the Vortex and we have a sandbag as a weight right now. What we have here in the way of a …

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

By Lance Piatt / Pulley Systems, Rock Exotica / 5 Comments

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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Pulley system efficiency tests with Petzl Maestro, I’d S, Pro Traxion and RollClip

By Lance Piatt / Blog, Petzl, Pulley Systems, Pulleys & Mechanical Advantage, RRG Gear Review / 186 Comments

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

By Lance Piatt / Blog, General Rigging, Horizontal Rigging, Mainline Systems and Operations, Mechanical Advantage, Pulley Systems, Pulleys & Mechanical Advantage / 36 Comments

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

By Peak Rescue Institute / Blog, Pulley Systems, Pulleys & Mechanical Advantage / 24 Comments

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!

By Lance Piatt / Blog, Pulley Systems, Pulleys & Mechanical Advantage, RRG Gear Review / 12 Comments

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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