Pulley system efficiency tests with MAESTRO, I’D S, PRO TRAXION, ROLLCLIP... - Petzl United Kingdom
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Pulley system efficiency tests with MAESTRO, I’D S, PRO TRAXION, ROLLCLIP...

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.

Warnings

  • Read the technical notice before viewing the following techniques.
  • It is important to fully understand the information provided in the technical notice before using this complementary information
  • Mastering these techniques requires training.
  • Consult a professional before attempting to perform these techniques on your own.

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.

Test protocol:

- Ropes tested: 7 mm cord, SEGMENT 8 mm, PUSH 9 mm, CLUB 10 mm, PARALLEL 10.5 mm, AXIS 11 mm, VECTOR 12.5 mm.

- Measurements were made with a constant pull rate of 1.5 meters/minute, on new devices and ropes.

- The results are given for information only; in the field there are numerous variables to take into account (position of haul system elements, rope diameter and construction, hauling speed, hauling smoothness, the haul load...).

Simple directional (1:1)

Simple directional (1:1) - MAESTRO S
Simple directional (1:1) - MAESTRO L
Simple directional (1:1) - I'D S
Simple directional (1:1) - PRO TRAXION
Simple directional (1:1) - MICRO TRAXION
Simple directional (1:1) - ROLLCLIP
Simple directional (1:1) - Am'D
Information

Note: pulley efficiency ratings in the Instructions for Use are based on values measured with a simple 1:1 directional.

Hauling efficiency F = xx M is the value obtained with the smallest compatible rope diameter for the device.

The pulley efficiency expressed in % is calculated from this value.

Efficiency is always less than 100%, the efficiency of an ideal pulley (impossible in reality).

Example for MAESTRO S: F = 116 M, efficiency = 86%

Pulley efficiency.

Simple directional (2:1)

Simple directional (2:1) - MAESTRO S
Simple directional (2:1) - MAESTRO L
Simple directional (2:1) - I'D S
Simple directional (2:1) - PRO TRAXION
Simple directional (2:1) - MICRO TRAXION
Simple directional (2:1) - ROLLCLIP
Simple directional (2:1) - Am'D

Haul system (3:1)

Haul system (3:1) - MAESTRO
Haul system (3:1) - I'D S
Haul system (3:1) - PRO TRAXION
Haul system (3:1) - MICRO TRAXION

Haul system (4:1)

Haul system (4:1) - MAESTRO
Haul system (4:1) - JAG TRAXION + JAG
Haul system (4:1) - JAG SYSTEM

Haul system (5:1)

Haul system (5:1) - MAESTRO

2. 3:1 haul system efficiency depending on the redirect point used

3:1 haul system efficiency depending on the redirect point used - MAESTRO + RESCUE
3:1 haul system efficiency depending on the redirect point used - MAESTRO + ROLLCLIP
3:1 haul system efficiency depending on the redirect point used - MAESTRO + Am'D