TheTreeSpyder
Branched out member
- Location
- Florida>>> USA
A climber operating/moving on a standard DdRT; controls 2 legs of pulls on themselves by a single leg adjustmeant of the friction hitch; for a 2:1 lift or lower (at a theoretical Zer0 friction at the support).
This 2:1 can be also employed in a rigging by the climber iff(if and only if); distance/force can be input into the load side of the line by moving the load or stretching the rope device. Kinda a reverse DdRT.
Line tension is the ballast force to load force; so pretensioning the line can be key to getting more float and or direction over an obstacle. The climber position is key here; as only they can operate both legs of the redirect for the possibility of the 2:1; and also adding their bodyweight force to the pretensioning; that ground control can also add their forces below.
If the load branch can be lifted up some; and the climber can reach it or it's line while haing on the control side; this can be achieved. If the limb cannont be moved up or over by this effort, then distance/force cannot be input at this position, and no 2:1. Unless a dynamic line is used; and the climber climbs up halfway or so to the support and performs a pull up on the line. Then, distance force can be loaded into the elasticity factor, and the 2:1 is achievable. If the limb can be lifted by this effort on the line, and the climber is just over the load/limb; and reaches out further than the hitchpoint; more than 2:1 for the effort can be achieved; then minus limb flex.
If, instead of lifting with arm force; and passively receiving the equal and opposite at the pull point on the control leg, the climber employs a foot cam and flexes leg muscle as force input; they can get 2x leg lift + bodyweight, rather than 2x arm lift + bodyweight for their efforts. The add ground inputs to that. Even more if climber can input lift beyond hitchpoint on load.
This all works with a pulley for rope or pivot for lever devices by inputting force on one side and capturing the equal and opposite force on the other side of the reverse pulley/pivot. It has maid things much more positive and possible for me; many times over.
SuperBob (our teenager) shows how this is done. This is the same science as 2-Handing a pulley system to get 4xeffort from a Z-Rig/3:1 or 8xeffort from a 5:1 etc. We just input the equal and opposite part of our force into a moveable target point, rather than just expending it on a an immoveable anchor point! Thereby we close the system more unto it's ownself; and not exert effort or it's equal and opposite on outside events; rather folding this envelope closed unto it's self. Just another way for wee ants to win out over the mighty matchstix!
This 2:1 can be also employed in a rigging by the climber iff(if and only if); distance/force can be input into the load side of the line by moving the load or stretching the rope device. Kinda a reverse DdRT.
Line tension is the ballast force to load force; so pretensioning the line can be key to getting more float and or direction over an obstacle. The climber position is key here; as only they can operate both legs of the redirect for the possibility of the 2:1; and also adding their bodyweight force to the pretensioning; that ground control can also add their forces below.
If the load branch can be lifted up some; and the climber can reach it or it's line while haing on the control side; this can be achieved. If the limb cannont be moved up or over by this effort, then distance/force cannot be input at this position, and no 2:1. Unless a dynamic line is used; and the climber climbs up halfway or so to the support and performs a pull up on the line. Then, distance force can be loaded into the elasticity factor, and the 2:1 is achievable. If the limb can be lifted by this effort on the line, and the climber is just over the load/limb; and reaches out further than the hitchpoint; more than 2:1 for the effort can be achieved; then minus limb flex.
If, instead of lifting with arm force; and passively receiving the equal and opposite at the pull point on the control leg, the climber employs a foot cam and flexes leg muscle as force input; they can get 2x leg lift + bodyweight, rather than 2x arm lift + bodyweight for their efforts. The add ground inputs to that. Even more if climber can input lift beyond hitchpoint on load.
This all works with a pulley for rope or pivot for lever devices by inputting force on one side and capturing the equal and opposite force on the other side of the reverse pulley/pivot. It has maid things much more positive and possible for me; many times over.
SuperBob (our teenager) shows how this is done. This is the same science as 2-Handing a pulley system to get 4xeffort from a Z-Rig/3:1 or 8xeffort from a 5:1 etc. We just input the equal and opposite part of our force into a moveable target point, rather than just expending it on a an immoveable anchor point! Thereby we close the system more unto it's ownself; and not exert effort or it's equal and opposite on outside events; rather folding this envelope closed unto it's self. Just another way for wee ants to win out over the mighty matchstix!
