Deperdussin Monocoque

The Deperdussin Monocoque was an early racing aircraft built in 1912 by the Aéroplanes Deperdussin, a French aircraft manufacturer started in 1911 and reorganized as the Société Pour L’Aviation et ses Dérivés (SPAD) in 1913. It is so named because of the method of construction of its fuselage. The aircraft is noted for winning the Gordon Bennett Trophy in 1912 and 1913, and for raising the world speed record for aircraft to 130 mph (210 km/h).

The usual method of construction of an aircraft’s fuselage at this time was to use a wire braced box-girder covered in fabric. The first use of monocoque construction in aviation is attributed to Eugene Ruchonnet, a Swiss marine engineer who had built an aircraft nicknamed the Cigare in 1911, which had a fuselage constructed by building up several layers of thin wood, each lamination applied at right angle to the one underneath.

The Deperdussin Monocoque was a mid-wing monoplane with parallel-chord wings with the spars made of hickory and ash, and ribs made of pine. The fuselage was made in two halves, each made by glueing and pinned a layer of tulip wood to a framework of hickory supported by a former, and then applying two further layers of tulipwood, the thickness of the shell being around 4 mm (5’32 in). The shells were then removed from the formers, internal fittings added and the two halves glued together and covered in fabric. Every effort was made to reduce drag: a large spinner was fitted over the hub of the propeller and the undercarriage was an aerodynamically clean design made from a pair of U-shaped plywood frames.

Made in France

Year: 1914

Length: 6.1 m (20 ft)

Crew: 1

Powerplant: 1 × Gnôme Lambda (14 cylinders)

Power: 160 HP (120 kW)

Max speed: 201 km/h (108.42 kn)

Weight: 612 kg (1,350 lb)

Materials: wood, coated and painted canvas and metal

Bourget Museum (ParisFrance)

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