# 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 is attached to an anchor point and returns back down to ground level.

The amount of effort required to lift the load in this situation is 100kg so we have not formed any mechanical advantage. This system has a ratio of 1:1, additionally for every metre of rope that the user pulls through the system the load will be raised by a metre.

All this system does is change the direction of where the effort needs to be put in, instead of pulling the rope in an upwards direction it can now be pulled downwards which is usually more efficient. This is commonly referred to as a directional or redirect pulley.

In this situation the directional or redirect pulley and its anchor point will actually be feeling double the weight of the load, as there is the loads weight on one side and an effort of 100kg needs to be applied on the other side to raise the load.

## 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 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…

## 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…

We need you! Become a BETA Tester and help with the development of the ropebook platform. We’d like to put together a selected group of Testers to give us some feedback on the current BETA stage of the site.