The piano-wire axle is attached to the centre of the cross beam to provide some springing. Additional springing is provided by elastic bands across the axle inboard of each wheel. The wheels provided are strong spoked plastic hubs with solid circular-section sponge rubber material to make the tyres. Wooden spokes are built up on the hubs after which they are fabric covered. The undercarriage is attached by saddle clamps to the fuselage underside and lower wing centre section.
Doped nylon covering over the whole structure completes the model.
More modern heat-shrink covering materials may be used instead. There is plenty of space for the radio installation. The aileron servo fits in the lower centre section, driving the bottom ailerons via pushrods and bellcranks. The upper ailerons are connected to the lower ones by rigid wire rods. The wings are rigged with steel cable.