# The 2:1 Pulley System

If we take a 1:1 system and turn it upside down it will result in a 2:1 mechanical advantage. Instead of the pulley being attached to an anchor it is now attached to the load (pulley A).

On one side of pulley A the rope has been attached to a fixed anchor point, the rope on the other side of pulley A has been sent back down to the ground via a redirect pulley (pulley B) where the user applies the effort to lift the load.

As the load is being supported by two sections of rope (via pulley A), each rope will bear half of the loads weight or 50kg in this example. Pulley A is being subject to the full weight of the load (100kg).

The directional or redirect pulley (pulley B) supports half of the weight of the load (50kg) on one side but an effort of 50kg is being applied on the other side to raise the load, so pulley B and its anchor are actually being loaded with 100kg.

## Angular Vector Forces

Angular vector forces occur when ropes are passed through a deviation or a directional pulley. Dependent on the angle created, this can have a multiplying…

## Vector Forces

Vector forces become apparent whenever there is an internal angle greater than 0° between two or more rigging components or anchorage points. For ease of…

## Fall Factors

A fall factor is a simple representation of the severity of a fall. It can be used to evaluate the potential loadings exerted on the…

## The 1:1 Redirect Pulley System

In the illustration to the right we have a rope attached to a load weighing 100kg. The rope has been passed through a pulley which…

## The 4:1 Pulley System

This pulley system provides a 4:1 mechanical advantage. The user is required to apply a force of 25kg to raise this 100kg load, for every…

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