this is what i put together for my manager
So this is called a HYBRID climbing system, its a hybrid between a DYNAMIC climbing system and a STATIC climbing system. A dynamic climbing system is one in which both parts of the rope are moving when in use. Although this system will work with the rope simply running over the bark of the tree in an appropriate crotch or branch attachment point, it will be much more efficient with greatly reduced friction if a device such as a friction saver or pulley is used. These devices reduce friction at the tie-in point to varying degrees, saving wear on the rope, wear on the tissue of the tree, and wear on the user. This means the climber is able to move more quickly, efficiently, and longer while using one of these devices, simply by reducing the effect of friction on the system. The use of a dynamic system means that the climber’s body weight will be roughly divided between the two parts of rope. Forces at the tie-in point of dynamic climbing systems will typically only be the weight of the climber themselves. A static climbing system is one in which no part of the rope is moving when in use. Static climbing systems may be used on both parts of rope or on a single leg of the climbing line, typically called single rope technique (SRT). SRT involves using only one part of the climbing line to ascend or work; the other part is tied off or otherwise secured to an appropriate anchor (portawrap), usually at ground level. The use of a long enough climbing line and lowering device as an anchor with this technique can allow for the lowering of an incapacitated climber from the ground. An additional refinement is a hybrid system, in which a dynamic climbing system is piggybacked onto a static climbing system. Each of these systems will generate a variety of forces and all need to be evaluated for the appropriateness of their use in any given situation. With the single rope technique, all of the climber’s body weight is on one part of the line, which then goes up and over a tie-in point, returns to the ground and is secured in some manner, thus the tie-in point experiences twice the climber’s body weight and must be evaluated and chosen accordingly. Hybrid systems in which a dynamic climbing system operates off of, or in conjunction with, a static climbing system will generate approximately the same forces as when operated individually. However, prior to using a static system as a floating anchor or tie-in point, the climber must back up the static system with an appropriate knot or hitch properly secured (attatched to the portawrap). Once again, just as in SRT, a dynamic system piggybacked onto a single part of a climbing line passing over a branch then back to the ground will generate twice the weight of the climber at the branch and is not to be used with every tree. Climbers should, when making these choices and decisions, be fully aware of not only what forces individual climbing systems generate on their tie-in points, but also what forces they, as users, must generate within systems to move around. Knowledge of these forces will not only help them climb and work more efficiently, but also more safely.
Pros- quick to set up
- dont need to mess with throwball to isolate a limb (which saves alot of time)
- reduces friction from pulley also saves wear on the rope, wear on the tissue of the tree, and wear on the user.
- most important able to rescue the climber from the ground
Cons- a bit more gear
- twice the climbers weight at your tie in point
- having to work around the static line running down the stem of the tree (after practicing you get used to it)
- cant use it for every tree
