Leading Edge D-Structure: 2.3 kg

3 meter long leading edge D structure, carries all flight loads for +6 -3 g. 2.3 kilograms including the fiberglass on the web faces. Will go up to 2.5 or 2.7 kilos when I include the metal fittings, and there will be about 100-200 g of glue. But it's still pretty light. Notice in the spar, the balsa wood, which is 120 kg/m3, is replaced by 28 kg/m3 foam on the outer 110 cm of the wing.

Detailed Wing Structure

I'm working on the detailed wing structural model, starting with the front D-Section.
Ribs - 20 mm extruded polystyrene 28 kg/m3
Spar is 100 x 10 x 3000 mm dimension
Spar Caps - unidirectional carbon
Spar Web - Vertical Grain Light Balsa, 120 kg/m3
Spar Faces - 45 deg. fiberglass 0.2-0.5 mm thick to be determined
D-Section shell: 0.8 mm aicraft plywood
Strut attachment is not yet in place in these pictures (it will be at 50% span)