Jason Harries - Initial Design

My train of thought was based on the idea of simplicity and for that reason I researched into the history of cranes and got some ideas from the Ancient Romans.

Pentospastos

This was a simple crane design that used a simple triangular frame and a block containing three pulleys which is attached to a manual winch. With this formation it could could lift over 1000kg.

The general design is simple and depending on the material used it could withstand the forces required of it.

However the design will not allow it move the load too far, so the design must be altered if it is to fullfill the required result.

Also places to peg the support cables may be hard to find in a disaster scenario.

Polyspastos

This is a crane of simlair design to the Pentospastos but on a larger scale. This one has multiple lines coming from the winch to pulley block which gives it the ability to lift more weight.

This design has the same flaws as the first one, and to lift the larger force either a large human force would be needed or a mechanical force would be needed to turn the winch.

The designs do not completely full fill the required specification but the idea can be modified so that it can perform as needed.