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One piece of information often lacking in discussion of the Petzl ASAP is just how much rope is needed below the device to be sure it catches during a fall.
Absorbica L64 & L57 energy absorbers. How far do they extend? What is the force required to "tear" them open?
A test looking at the effect of a fall on the rope below the victim's chest ascender.
Last month I published the test report: Pulley + rope efficiency. As with most tests, I was left with even more questions. The key observation was that measured pulley efficiency varies significantly (up to 10%)
There more to measured pulley efficiency than just consideration of the physical bearings or bushings on the axle. This report considers the effect of losses within the rope.