Q: What makes a one pulley more efficient than another? There are a couple of key factors that affect the efficiency of a rescue pulley. The diameter of the sheave (the wheel in a pulley system that supports the rope) can make a difference – the smaller the diameter, the more bending of the fibers …
Efficiency Unveiled: Understanding the Mechanics of Rescue Pulleys 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 …
CMC MPD… A belay device or a pulley system? The MPD from CMC is designed to be used as a belay device to arrest a falling load should the main line fail. A very common question we field is regarding the “shared tension systems”. Shared tension systems are essentially two lowering systems in place of …
Rigging For Effect – Get Your Ropes Off the Ground Using A Rigging Workstation. Construction of a Rigging Workstation Focused locations for a multiple systems Better body position when operating systems Improves the angle of ropes when using a high directional If you’re technical rope rescue experience has been anything like mine, there has been …
Rigging For Effect – Get Your Ropes Off the Ground Using A “Rigging Workstation” Read More »
Calculating mechanical advantage: the T-system The subtle but significant difference to this system… a pulley on the load and the main line terminated at head of the tripod. We have a 6:1 mechanical advantage in the pulley system. 1. Assume continuous strands of rope have the same amount of tension. If we start at the …
Determining Mechanical Advantage using the T-Method with an added Pulley on the Load Read More »
Pulley Systems Introduction Victims in the field of rescue often times find themselves stranded somewhere well above head level on cliffs, mountains, bridges, buildings and other structures. The obvious challenge of importance to the rescue attempt is the need to get the victim down. Any ultimate benefit from the rescue maneuver hinges upon …
Pulleys & Systems for Rescue & Industrial Rope Access 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 …
How to calculate mechanical advantage within a progression! Read More »
©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 …
Ascenders and Clamps Technical Tips: How to calculate mechanical advantage 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 »
Force Multipliers To understand rigging is to understand at least some aspects of trigonometry and vector physics. The knowledge of angles, components, and resultants is synonymous with quality rope rigging. To study vectors is to study the physical qualities of force that has both direction and magnitude. There are two important distinctions we make in …
Force Multipliers and The Fundamentals of Mechanics Read More »
