I'D efficiency at the head of the system. - Petzl USA
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I'D efficiency at the head of the system.

Unlike a progress capture pulley, an I'D at the head of the system allows immediate lowering of the load if there is a problem, without system modification. But its efficiency is lower than that of a pulley.

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.

Efficiency comparison tests

The force required to raise a 100 kg mass was tested under several configurations with different devices at the head of the system: I’D S, Am’D carabiner and PRO TRAXION.

The results are given for information only, as they depend on numerous variables that are difficult to reproduce in each test.

Simple directional at the anchor (1:1 theoretical efficiency):

Simple directional at the anchor (1:1 theoretical efficiency) 1/3

Simple directional at the anchor (1:1 theoretical efficiency) 2/3

Simple directional at the anchor (1:1 theoretical efficiency) 3/3
 

Simple directional on the load (2:1 theoretical efficiency):

Simple directional on the load (2:1 theoretical efficiency) 1/3

Simple directional on the load (2:1 theoretical efficiency) 2/3

Simple directional on the load (2:1 theoretical efficiency) 3/3
 

Simple haul system (3:1 theoretical efficiency):

Simple haul system (3:1 theoretical efficiency) 1/3

Simple haul system (3:1 theoretical efficiency) 2/3

Simple haul system (3:1 theoretical efficiency) 3/3
 

Complex haul system (6:1 theoretical efficiency):

Complex haul system (6:1 theoretical efficiency) 1/3

Complex haul system (6:1 theoretical efficiency) 2/3

Complex haul system (6:1 theoretical efficiency) 3/3