The Petzl MAESTRO handle has a small hole for attaching a cord (e.g. AIRLINE cord). Buy The Petzl Maestro Warning: any excessive pulling on the handle can cause an uncontrolled release.Verify that no external object could accidentally pull on the cord. WARNING: use only a lightweight cord to operate the…

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…

All maneuvers must be done on two independent rope systems. These two systems can work in parallel (two haul lines) or separately (work rope and belay rope). 1. Examples of hauling with work rope and belay rope. All hauling and positioning forces are concentrated on the work rope. The belay…

With 900 lumens of lighting power, the SWIFT RL PRO is Petzl’s brightest compact headlamp. Lightweight and rechargeable, the SWIFT RL PRO features REACTIVE LIGHTING® technology, which automatically adjusts brightness to user needs. Equipped with mixed and focused beams, as well as white and red lighting, technicians will simply love this…

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…

I always appreciate great video.  Video (to me) is either aesthetic or technical and trying to bridge both is tough. This video from CMC is clearly technical, but I really appreciate the angles of perspective. So often the “clarifying message” of “the how” can get completely lost if the angles…