Does a purcell prusik shock absorb enough as a personal lanyard to prevent an ascender from desheathing a climbing rope if you were to take a short fall while passing an obstacle? A little is the answer but 1/2" ropes are so burly that they won't desheath even with a static sling in our tests. However, your spine may not appreciate 5kN+ so just don't fall.
1/2" rope with purcell - 4.10kN - Did NOT desheath - purcell slipped half way
1/2" rope with purcell - 5.18kN - Did NOT desheath - purcell slipped half way
8mm rope with purcell - 5.36kN - Did NOT desheath - purcell slipped a little
8mm rope with dyneema sling - 5.69kN - Rope Desheathed!
1/2" rope with dyneema sling - 5.8kN - Did NOT desheath
Our guest: Matt O’Donnell from Ebbetts Pass Fire District -
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Intro
02:32 Example of concern
07:07 1st Test
09:24 - 2nd Test
09:55 - 3rd Test
12:08 - 4th Test
13:08 - 5th Test