Mechanical Advantage

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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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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Drop loop haul on the Petzl I’D for urgent rescue, with Petzl ASAP

In certain cases of extreme urgency requiring a very rapid response, the rescuer can access the victim by descending on one rope. Once the emergency has been addressed, upward evacuation can be secured with two strands of rope.   WARNING: before using this technique, make sure to minimize the risk of rub points or rockfall …

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An Introduction to Jiggers

The following information is meant only as an informational introduction to the loveable jigger system. An Introduction to Jiggers Generally, these beauties are considered pre-rigged pulley systems used mainly for hauling, but can be very important in lowering heavy loads as well. The advantage of these systems is in their rapid deployment, and straightforward operation …

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New Technician Courses Just Released for Rigging Lab Academy

Hey all We just completed another 4 high level training courses within the Technician Level Cornerstone course curriculum. Force Multipliers Elevated Anchor Systems Horizontal Systems Midwall Pickoffs Midwall Pickoffs Midwall rescues can run the full gamut of rescue complexities. It can include almost everything from one or two people coming to the rescue of a …

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Think Smart and Powerful… Employ Multi Use Devices

Thinking smart is power.  Power is the ability to get things done with an element of Authority.  Authority carries with it a mantle of Responsibility.  Responsibility carries with it the need for planning and expected outcomes. The following is quick mini look at developing a mindset of “multiplicity”.  Manpower is expensive.  Equipment is relatively cheap …

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Dynamic Directionals-One of the Great Inventions in Rescue and Rigging

Dynamic Directionals (a type of offset) are useful in adjusting the main line and belay from above the rescue page or in some cases, from across a gap or chasm. The use of this system usually requires a fair amount of horsepower, at least a mechanical advantage of  6:1 or 9:1, but not always.  As …

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