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Construction comprised a double sandwich of glass-fibre reinforced composite over balsa wood. The wings are double-tapered with a modified Wortmann FX 62-K-131 profile at the root and Wortmann FX 60-126 at the tip. The wings were of fiberglass/balsa wood sandwich construction and were built in the traditional manner using negative molds.
A stick & tissue balsa model airplane under construction, still manufactured by Guillow's. During World War II, the supply of balsa wood was diverted to the war effort for the manufacture of rafts and life jackets. Guillow's was forced to use alternative materials like cardboard or pine wood to manufacture the model kits.
From World War I through the 1950s, static model airplanes were also built from light weight bamboo or balsa wood and covered with tissue paper in the same manner as with flying models. This was a time-consuming process that mirrored the actual construction of airplanes through the beginning of World War II .
Model glider aircraft are flying or non-flying models of existing or imaginary gliders, often scaled-down versions of full size planes, using lightweight materials such as polystyrene, balsa wood, foam and fibreglass. Designs range from simple glider aircraft, to accurate scale models, some of which can be very large.
A recent trend is toward wood-composite aircraft. The basic load carrying material is still wood, but it is combined with foam (for instance, to increase buckling resistance of load carrying plywood skins) and other synthetic materials like fiberglass and carbon fiber (to locally increase the modulus of load carrying structures such as spar caps).
It was powered by a 7 hp (5 kW) West Bend engine and mounted on top of a Rogallo-type flexible wing hang glider; the propeller was 3 feet (1 m) in diameter and was made of balsa wood, covered with fiberglass and mounted in pusher configuration.