Rappelling with a Heavy Pack: The Extension Test
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A disagreement about if extending a rappel device away from us while on rappel makes it easier to hold ourselves up while wearing a heavy pack moved into a discussion about pivot points and centers of mass, and it got me thinking more deeply about this question. So I set up a test. See the full video to go deeper into the result and the physics.
My preferred plaquette-style belay device is the DMM Pivot.