Technical Information ©Petzl Insights Into Carabiners Carabiners are rated in capacity by loading along the long axis. They have little strength when side-loaded along the short axis. Some offset carabiners, such as the modified “D” carabiner, help prevent side loading. Make sure to always load a carabiner along its spine…

©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…

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…

This is a repost from Petzl. These folks have it right! NOT A SINGLE PRUSIK IN THE SYSTEM Why one Utah SAR team transitioned to the MAESTRO SEPTEMBER 29 2020 ON-SITE RESCUE “Give us thirty seconds,” said Utah County Search and Rescue Incident Commander, Jared Hansen. Thirty seconds to transition…

What if trees had ratings? What an amazing concept. John Morton, an engineer-scientist-visionary-technician, has been doing canopy studies for years and knows how they are affected by wind. Trees, whether alone or in community, are all influenced by wind and all have a certain “wind rating” to them. When SAR members…

The Arizona Vortex Guidebook Video Course On behalf of Rigging Lab Academy, I’m Rob Stringer and I’d like to welcome you to our instructional series on the Arizona Vortex. So the user manual and the video series are set up to enable you to use the Vortex and set it…