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Types of Hauling Systems<br />

There are three types of hauling systems:<br />

anchor<br />

stationary<br />

pulley<br />

Figure 1<br />

hauling<br />

line<br />

moving<br />

pulley<br />

1. Simple Hauling Systems<br />

A simple hauling system is when all moving<br />

pulleys are attached to the load.<br />

2. Compound Hauling Systems<br />

A compound hauling system is a simple<br />

hauling system that is pulling on the end of<br />

another simple hauling system.<br />

In this example (Figure 2) the two separate<br />

systems are joined using a prussic hitch.<br />

prussic<br />

hitch<br />

A simple system<br />

pulling on<br />

another<br />

simple system<br />

Pulley<br />

traveling<br />

down<br />

Figure 2<br />

3. Complex Hauling Systems<br />

traveling<br />

up<br />

A complex hauling system is created when<br />

you have a moving pulley that is traveling in<br />

the opposite direction to the load.<br />

Figure 3<br />

How to calculate the <strong>Mechanical</strong> <strong>Advantage</strong> - 2 - By Tim Fox & Mick Holton<br />

of hauling systems, 2nd edition.<br />

Thanks to Reed Thorne