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

Written By: Lance Piatt

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 devices at the head of the system and with ropes of various diameters

  • MAESTRO S and L are built with the same pulley so their efficiency is the same.
  • Ropes tested according to diameters: 7 mm cord, PUSH 9 mm, AXIS 11 mm, VECTOR 12.5 mm.
  • The results are given for information only, as they depend on numerous variables that are difficult to reproduce in each test (position of haul system elements, rope diameter, hauling speed, hauling smoothness, the haul load…).
Simple Directional (1:1)
Simple Directional (2:1)
Haul System (3:1)
Haul System (4:1)
Haul System (5:1)
2. 3:1 Haul system efficiency depending on the redirect point used.

 

Gear Used In This Study

 

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Peace on your days…

Lance
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About The Author:

Picture of Lance Piatt

Lance Piatt

Beginning his career in the rescue and rigging world as a “blue collar” SAR member with Deschutes and Jefferson County teams. Lance Piatt owns and operates Red Ibex Solutions, a sales and marketing wheelhouse blending rope rigging education and exquisite imagery with equipment knowledge and understanding; housing Rigging Lab Academy and Rescue Response Gear… Lance is producing high-end video education, working with several experts and instructors to produce unique series of “how to videos” and courses for rope rigging: Such as; the first ever full-length rescue training DVD, 'Tower Rescue', released in fall of 2005. As well as a series of scenario-based rescues ranging from cave rescue to cliff rescue.

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