The belayer uses tandem prusiks or a device that is designed to catch a rescue load.
Rope rescue lowering systems.
Rescue rope is a very important tool and is without a doubt very versatile.
The resulting two rope system clearly passes both the critical point test and the whistle test the rescuer lowering the load uses a descent control device.
The formula to calculate friction when lowering a load is.
4 locking carabiners 2 prussiks minding pulleys brake bar radium.
Rope rescue system kit 2 545 everything but the rope to fully outfit the rope rescue system kit for a complete systems package this kit includes the gear to rig a main line lowering or raising system mechanical advantage and a separate belay system.
It is common to observe big swings from 90 10 to 10 90 between the two as the operators attempt to match each other s rate of lower.
Using the above formula and substituting 100 kilograms for the weight and 0 1 i e 10 for the friction loss shows that the hand must hold 90 kilograms.
How to construct a raising and lowering system with a 3 to 1 mechanical advantage hardware.
Dual main system using cmc rescue mpds for lowering systems like the one shown above while functional make it very difficult to match the tension in the two ropes.
Rope can be used to construct raising and lowering systems highline systems mechanical advantage travel restrict systems and much much more.
3 1 system the 3 1 is the classic mechanical advantage system used by rescuers.