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Topic	Date	User
How strong are prusiks?	19-Jun-2016 At 9:59:02 PM	kieranl
Message
The tests were on a highline for rope-rescue using semi-static rope. So there's already about 5% rope-stretch. Then the standard is to tension with just one person using a 3-1 mechanical advantage so there is nothing like the tension that can be got with a slack-line and there is significant sag in the middle of the span. Here's another video of the same testing day, same test but using MPDs for belays instead of prussiks. Actual mass was 272 kg. Peak force at anchor 7.24 kN. https://www.youtube.com/watch?v=zOaKUJ0ZuRU In the background you can see an observer on another highline which has very little sag. That highline is a double track on HTP (very low-stretch) rope. Would probably get very different results with that

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