The design report

Material type was chosen for each component. The components that were going to carry
maximum load were ply, paulownia was used where some load would act. Balsa was
used where minimal load would act and for components that were merely for providing
shape.
Most of the ribs were 2mm thickness except the ones on top the fuselage which carried
maximum load and therefore they were 4mm thick. Ribs were of all three types ply,
paulownias and balsa depending on the amount of load they were carrying. Webspars
were 3mm thick. The spar caps at the front and at 30% chord were 6mm x 6mm pine
rods. All webbing was 2mm balsa. Rear end sheets were 2mm balsa because their
purpose was to provide shape and contact surface for the film.
The following figures from 4.1.117 to figure 4.1.122 show the materials used for the
wing components. Blue colour is for balsa, green for ply, pink for paulownias, black for
carbon rod and yellow for pine.
Figure 4.1.117 Figure 4.1.118
Figure 4.1.119 Figure 4.1.120
Figure 4.1.121 Figure 4.1.122