Rope Rescue Lowering Systems

In this illustration a 100 kilogram load is being lowered through a pulley with 10 friction.

Rope rescue lowering systems.

The formula to calculate friction when lowering a load is. 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. 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. 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.

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. It requires less rope than a non piggybacked 2 1 system is reasonably easy to rig is easy to add a progress capture device provides an appropriate amount of mechanical advantage to raise one or two people and with a few tweaks it can be converted into a simple 5 1 system. How to construct a raising and lowering system with a 3 to 1 mechanical advantage hardware. Through the use of various knots auxiliary equipment and an open mind much can be accomplished with a rescue rope.

The belayer uses tandem prusiks or a device that is designed to catch a rescue load. 4 locking carabiners 2 prussiks minding pulleys brake bar radium. Rope can be used to construct raising and lowering systems highline systems mechanical advantage travel restrict systems and much much more.