Tree Machine
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Especially when carrying a big saw when I would not mind being on 2:1. I will sometimes go to 3;1 climbing in these situations. Sort of a (RADS) One of the things that is necessary is to transfer more work to your legs.
Here is where you're having to determine and set up, either in advance or in the moment, your climbing rig to accommodate what it is you're doing.
On this specific note, a twin line, over a single line, offers double the rope for footlocking, making footlocking much more certain and simple.
And it doesn't matter whether you're out hanging in space, or up against a trunk, footlocking is just plain easier than single.
Note that both 2:1 DdRT and SRT give your feet only one line to grip. Asecond, parallel footlocking line offers twice the friction in a place where that makes a substantial difference.
And because the difference is so substantial, you will find that adding a foot ascender into the mix is entirely unnecessary, eliminating one of the 'pieces' that make up the system.
In further comparing and contrasting the systems, we should count the physical number of pieces in the system required for it to function as intended. I've seen SRT setups requiring 6 or 8 pieces, kind of a lot of parts if you ask me.
Kevin, can you list all the components of the wrench system?
I'll start:
Rope Wrench
cord from wrench to connector
friction hitch
micropulley
stainless steel clevis
The connector itself
5 piece, six if you count the connector (caribiner)
In a 2:1 DdRT you might throw an additional dogleash, a friction saver and the multiple components necessary to set and retrieve that remotely.
Any of the gear setups for any one of the three rope techniques can be seen as piece-intensive, based solely on the number of parts, or action-intensive depending on the number of hands required to operate the system, or motion-intensive depending on the number of motions needed to accomplish your tasks. Or expensive depending on how much each of the components to the system costs.
Any system should be judged on its stand-alone merit. The above partially outlines what should be looked at regarding the physical parts and pieces.
I feel that if mankind can develop a space shuttle and international space station,we can come up with a ONE-PIECE device that can handle all three rope techniques. Am I out of the park on this one?
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