Thank you so much for sharing you knowledge with all of us, i really like your videos and the way you explain things out makes it very easy to understand. It is really helpfull, thank you!
@@mascatrails661 : Actually, not. The load has to be applied along the spine (back, ungated) part of the carabiner, and installing it gate-down facilitates that. What IS important is that a horizontal carabiner close to the ground NOT have its gate down on the ground, and that a vertical screw-lock carabiner have the opening of the gate (mouth) downward so gravity is unlikely to unscrew the locking cylinder.
Most arborists will reach a horizontal pulling limit due to loss of traction at about one third of body weight. Note, I am not talking about NBA basketball courts and sneakers here. Now, If you are talking about redirects from a vertical position where you can literally hang from the tail of the rope, then gravity is in alignment with the rope and pulling your body weight depends on fitness. If you are talking about pulling over the top of a leaner at an angle, then you have a vertical component of force which reduces your traction. If you are talking about skidding brush, then the coefficient of friction for the brush would be similar to the friction for the arborist's boots and yes, you could drag nearly your weight in brush, but if you put a load cell in the rope, then you would see that the force applied is much less than your body weight. The danger comes when estimating forces. If you can only generate one third of the force expected, then you are over matched. In tree work, there are consequences for being wrong.
Sorry, but, but it's NOT a "fact" that a person can pull his own body weight on a load attached to a rope, unless he's tied into the rope and is hanging vertically. Field tests have determined that a fit person's gloved hand on a half inch kernmantle rope can pull 50 lbs before slipping. That is the factor we use to determine the size of a hauling team on a rescue system: the load in pounds divided by the mechanical advantage of the system, divided by 50 lbs = the number of members of the hauling team.
I weigh 230 lb and I am 6'3 and I can easily pull myself up on a single rope and if I am anchored against a tree I know that I can pull more like 250 and have done it several times I'm not your average person by far but I would say 50 is probably the average on an open Pull
Thanks for the informative video! Who makes those twin blocks?
Thank you so much for sharing you knowledge with all of us, i really like your videos and the way you explain things out makes it very easy to understand. It is really helpfull, thank you!
Guys. Love your work. However, please do a quick re-post, changing "Mechanicle" to "Mechanical" in the title.
Hi
what the considerations, for preferring the gate, facing down?
less chance of the gate interacting with the rope above it and failing
@@mascatrails661 : Actually, not. The load has to be applied along the spine (back, ungated) part of the carabiner, and installing it gate-down facilitates that.
What IS important is that a horizontal carabiner close to the ground NOT have its gate down on the ground, and that a vertical screw-lock carabiner have the opening of the gate (mouth) downward so gravity is unlikely to unscrew the locking cylinder.
crazy that that actually works
Most arborists will reach a horizontal pulling limit due to loss of traction at about one third of body weight. Note, I am not talking about NBA basketball courts and sneakers here. Now, If you are talking about redirects from a vertical position where you can literally hang from the tail of the rope, then gravity is in alignment with the rope and pulling your body weight depends on fitness. If you are talking about pulling over the top of a leaner at an angle, then you have a vertical component of force which reduces your traction. If you are talking about skidding brush, then the coefficient of friction for the brush would be similar to the friction for the arborist's boots and yes, you could drag nearly your weight in brush, but if you put a load cell in the rope, then you would see that the force applied is much less than your body weight. The danger comes when estimating forces. If you can only generate one third of the force expected, then you are over matched. In tree work, there are consequences for being wrong.
Sorry, but, but it's NOT a "fact" that a person can pull his own body weight on a load attached to a rope, unless he's tied into the rope and is hanging vertically. Field tests have determined that a fit person's gloved hand on a half inch kernmantle rope can pull 50 lbs before slipping. That is the factor we use to determine the size of a hauling team on a rescue system: the load in pounds divided by the mechanical advantage of the system, divided by 50 lbs = the number of members of the hauling team.
I weigh 230 lb and I am 6'3 and I can easily pull myself up on a single rope and if I am anchored against a tree I know that I can pull more like 250 and have done it several times I'm not your average person by far but I would say 50 is probably the average on an open Pull
Lll