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Petzl Ascentree (half)

Front View: Closed Rear View: Closed
Front View: Closed Rear View: Closed
 
Front View: Open for Rigging Rear View: Open for Rigging
Front View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired a second Petzl Ascentree from Expé-Spelemat in 2009 and cut it in half to make two single right-hand ascenders, one for my friend Bob Thrun and one for me. I reacquired the latter in 2017 as part of Bob Thrun's collection.

The resulting Petzl Ascentree half is 189 mm. tall, 99 mm. wide, 23 mm. thick, and weighs 197 g. The rope channel is 15 mm. wide. The cam radius increases from 39 to 55 mm. over an angle of 34°, giving a 30° cam angle. The tooth pattern is (3.4)(1S1.2S2)^2(1S1)(2.3), where the "S"s stand for the single longitudinal mud removal slot.

Comments

When the Petzl Ascentree first came out, I assumed that it was made by riveting two Petzl Ascension ascenders together, but when the new Ascension came out, it ws clear that it was a different ascender. I was curious how well half an Ascentree would work as an ascender. Bob Thrun had the same idea, so we bought an Ascentree and I cut it in half. Unfortunately, there is no way to get a left-hand version.

The main attachment hole is directly in line with the rope channel. This is an efficient consequence of this being half of a symmetric ascender. With this tie-in locaton, though, comes a bit more interference between the sling and the standing line. I do not consider this significant,

The cam safety on the Ascentree lacks the sharp thumb-stabbing projection found on the ~2010-vintage Petzl Ascension ascenders. I think that the ine on the Ascentree is almost too smooth; frequently I find my thumb sliding off rather than moving the safety.