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

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