The robot had a steel chassis, polyurethane tyres for extra grip, and two 24V EMD 700W motors. The original Crusader that appeared in Series 3 was painted yellow and black with a hazard sign printed on the top armour, and featured a wider lifting arm. This ensures that the axles cannot be bent and also provides protection to the wheels on all sides.' - The Crusader website The wheels are mounted on axles which are supported between the outer 2 chassis spars on each side. The resulting chassis is light weight (less than 16Kg) but very strong. All the spars and braces have lightening holes which also aid access for assembly. Again each of the braces is flanged for rigidity. Each spar is flanged to increase its rigidity and finally braces have been added perpendicular to each of the spars. ' The robot has a welded high strength steel chassis made from 6 main spars which travel the length of the robot giving it good strength along its main axis.
