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I believe it is setting a high-line to suspend the climber over a bad tree. The arrow shows the deflection of the highline downward, under the load of the climber. The right/ higher side is using many redirection points to compress each stem, rather than lever sideways on the small branches...

Sorry Marc (is your first name Marc-Antoine, or is Antoine your family name, or something?), I didn't understand your point about apparent weight. My thinking is that we need to look at vector forces (force plus direction of force) all the time. As you pointed out, a pendulum swing acts on the...

I don't quite get that hysteresis. Friction involves a Normal Force, and a coefficient of Static friction until it starts to move, then there is the coefficient of dynamic friction involved. Also in real world work, bark get polished, smoother with slight movement back and forth. There...

Dave, you are smart and a good communicator. Time to go do some work. Zero TIPs involved.

Ok. Sure. Since we were discussing science, I was using the scientific definition of theory. I can be pedantic. Sorry. DdRT TIPs obviously (to me) sometimes experience more than the climbers full weight. The 100% versus a supposed 200% are relative to each other. Perhaps do your...

There are no opinions in physics. Theory are well proven. Most laymen have no idea what a hypothesis or theory are. There is the Theory of Gravitational attraction, for example. There are ideas. Sometimes these are formed into a testable hypothesis. Anytime anyone says that my...

The limb supporting the climber takes force off the rope. I used three strand in my maasdam on a tipped tree, natural crotched, and double-whip tackled. I cranked that thing pretty tight in an open alder crotch, but the second leg stayed pretty slack. It was enough to do the job, and notes...

I natural crotched a three-strand rope in a tipped alder for a guy-line, tensioned with my maasdam rope-puller. 2:1 mechanical advantage, right? Double the force, right? One side was slack as the other was tight, with a considerable pull. Rope was bent close to 180°, dry conditions, high friction.

Neither doubles the load. SRT magnifies the load, can optimized the loading, and can have back-up crotches. DdRT means you have to have no snags in your standing-end in order to descend in an emergency. Rarely do I go higher than my 120' main climbing line allows me to get down from lickety...