Rope Rescue Mechanical Advantage Systems

3 1 system the 3 1 is the classic mechanical advantage system used by rescuers.

Rope rescue mechanical advantage systems.

Components of a mechanical advantage system. For example a 2 1 or 3 1 system these are pronounced as a 2 to 1 and 3 to 1. 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. In a 3 1 mechanical advantage system mas a 300 lb load would feel like 100 lbs and 3 feet of rope will move the load up 1 foot.

A system s mechanical advantage is expressed as a ratio using a colon. Understanding how mechanical advantage is calculated will help you create the perfect pulley configuration for any rescue mission you re up against. Even if you only need to raise a load 20 feet using a 5 1 you will have to pull a whopping 100 feet of rope and probably reset the system many times. Raising systems are essential in any rescue or rigging scenario in which loads are lifted using rope.