A comparison was made by building FEA
models of the largest component in the frame, in both
materials. Although slightly heavier, aluminium was chosen
because it would be easier to modify when further changes
were needed on the new prototype and it would be more
cost effective for a small initial production batch.
Our consultants also investigated whether to share the
loads between the frame and the panels. Although this
could save some weight, it was not done in the prototype
because speed of assembly and ease of changing damaged
panels in service were considered more important. By also
redesigning and deleting some parts the weight of the
chassis/ frame was reduced from 9.75 to just 3.7kg.