(Deperdussin) Monocoque @·AIRCRAFTUBE

  • Deperdussin Monocoque Deperdussin Monocoque
    Deperdussin Monocoque
  • Deperdussin Monocoque<br>Guillaume Busson - René Vidart - Jules Védrines - Maurice Prévost Deperdussin Monocoque<br>Guillaume Busson - René Vidart - Jules Védrines - Maurice Prévost
    Deperdussin Monocoque
    Guillaume Busson - René Vidart - Jules Védrines - Maurice Prévost
  • Armand Deperdussin Armand Deperdussin
    Armand Deperdussin
  • Maurice Prévost at the Monaco 1913 Schneider Trophy Maurice Prévost at the Monaco 1913 Schneider Trophy
    Maurice Prévost at the Monaco 1913 Schneider Trophy
  • Louis Béchereau Louis Béchereau
    Louis Béchereau
  • Prevost, Gordon Bennett Cup winner Prevost, Gordon Bennett Cup winner
    Prevost, Gordon Bennett Cup winner
  • Hydro Monocoque Hydro Monocoque
    Hydro Monocoque
  • Thorpe Park, November 1979 Thorpe Park, November 1979
    Thorpe Park, November 1979

Deperdussin Monocoque

The Deperdussin Monocoque was an early racing aircraft built in 1912 by the Société Pour les Appareils Deperdussin, commonly abbreviated "SPAD". It is so named because of the method of construction of its fuselage. The aircraft is noted for winning the Gordon Bennett Trophy in 1913, and for raising the world speed record for aircraft to 126 mph (203 km/h). This aircraft is sometimes confused with the Deperdussin 1912 racing monoplane, which won the 1912 Gordon Bennett race at 106 mph (171 km/h) and was first aircraft to fly faster than 100 mph (160 km/h).

Background

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 being applied at right angle to the one underneath. The usual method of construction of an aircraft's fuselage at this time was to use a wire braced box-girder covered in fabric. Ruchonnet's technique, in which the outer surface of the structure is load-bearing, would become the usual method of aircraft construction.

The Deperdussin Monocoque was a development of an earlier racing aircraft designed by Louis Bechereau which was first flown at the end of 1911 and which won the 1912 Gordon Bennett Trophy race. This aircraft made partial use of the monocoque technique, with a pair of curved load-bearing shells used in conjunction with a conventional wooden box-girder.

Design

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.

Service History

Deperdussin entered three aircraft for the 1913 Gordon Bennett Trophy race, which was held as part of the week-long aviation meeting at Rheims in September 1913. These were flown by Prevost, Gilbert and Rost. A fourth aircraft was entered by Crombee, representing Belgium in the competition. The aircraft flown by Prévost had been modified by reducing the span of the wings. Elimination trials were held to decide who would be the three entrants to form the French team. Prévost came first and Gilbert third, second place being won by Jules Védrines in a Ponnier monoplane.

The race was won by Prévost, who completed the 200 km (120 mi) course in 59 min 45.6 seconds, an average speed of 200.5 km/h (124.6 mph).

SPAD (Société de production des aéroplanes Deperdussin)

The company was set up in 1911 as Aéroplanes Deperdussin, becoming the Société de Production des Aéroplanes Deperdussin in 1912. Its founder Armand Deperdussin (born 1867) had been a travelling salesman and a cabaret singer in Liège and Brussels, before making his fortune in the silk business. Deperdussin became fascinated by aviation in 1908, and in 1909 he established an aircraft works at Laon. Deperdussin himself was not a designer, but he hired the talented engineer Louis Béchereau (1880–1970) as technical director. Béchereau was responsible for Deperdussin and SPAD aircraft designs thereafter.

The first Deperdussin aircraft was an unsuccessful canard, but their next aircraft, the Type A, was an immediate success, and led to a series of closely related monoplanes. Similar to Louis Blériot's Blériot XI, and the Nieuport IV, this was a layout popular with both the military and civilians before the First World War. The Deperdussin TT was a considerable export success, and 63 were built by the Lebedev company in Russia and others at Highgate in London by the British Deperdussin Company. From 1911 onward Deperdussin produced aircraft at a new factory at Grenelle, in the suburbs of Paris.

They also established factories at Le Havre and Juvisy to build motor boats and waterplanes, as well as three flying schools.

The company also produced a number of notable racing aircraft, including the groundbreaking Deperdussin Monocoque, which won the 1912 and 1913 Gordon Bennett Trophy races, set several world speed records and was the first airplane to exceed 200 km/h (120 mph). The first Schneider Trophy competition, held on 16 April 1913 at Monaco, was won by a Deperdussin floatplane at an average speed of 45.75 mph (about 73 km/h).

In 1913, Armand Deperdussin was arrested on charges of fraud. He had developed expensive tastes and, in addition to funding competitions such as the Gordon Bennett Cup, he entertained lavishly. The trading arm of the Comptoir Industrial et Colonial bank claimed that he funded this by fraudulently borrowing from them using forged receipts from his silk business as security. He remained incarcerated until he was brought to trial in 1917. Although it was claimed that he used much of the money to develop France's aviation expertise, he was convicted and sentenced to five years in prison, but as a concession for first offenders he was reprieved ("sursis") and released immediately. Deperdussin never recovered from the incident and committed suicide in 1924.

SPAD (Société Pour L'Aviation et ses Dérivés)

After Armand Deperdussin's bankruptcy in 1913 the company went into administration and the name was changed to Société Provisoire des Aéroplanes Deperdussin, the first name to use the SPAD acronym. With Deperdussin's disgrace the cash flow stopped and the future of the SPAD company was endangered. A consortium led by Louis Blériot bought up the company's assets in 1913. The new company was renamed the Société Pour L'Aviation et ses Dérivés which allowed the retention of the SPAD acronym.

The first Béchereau-SPAD designs were unusual two-seat biplanes which attempted to provide a forward-firing machine gun in a tractor configuration aircraft. The pilot sat behind the airscrew, as in a tractor design, but the gunner was seated in a nacelle, or pulpit, in front of the propeller, attached to the landing gear. These designs, the SPAD A-series of models A.1, A.2 A.3, and A.4, were built in very small numbers, around sixty each for French and Russian air forces, and were neither popular nor successful. The subsequent development of an effective machine gun synchronizer by the French rendered this unusual configuration unnecessary.

Other early Béchereau designs for SPAD were generally unsuccessful. The SE, a large twin-engine biplane bomber, performed well on trials, but it was not ordered due to the greater promise of Béchereau's next design.

Béchereau's first real success was the SPAD S.VII, which superficially resembled a smaller, neater A.2, without the forward gunner's nacelle. Developed from the SPAD V, of which 268 were ordered but none certainly built as SPAD Vs, the SPAD S.VII was a single-seat tractor biplane fighter of simple and robust design powered by the new Hispano-Suiza water-cooled V-8 engine. Compared to earlier fighters, when the SPAD VII appeared in 1916 it seemed a heavy and unmanoeuvrable aircraft, but pilots soon learned to take advantage of its speed and strength. Some 3,500 SPAD S.VIIs were built in France, 120 in Britain, and 100 in Russia during the First World War, although many more had been ordered from a new factory in Yaroslavl, which was not completed until after the Russian Civil War.

Béchereau's subsequent wartime designs followed the basic outline of the SPAD S.VII. The two-seaters, the SPAD XI and SPAD XVI, were built in moderate numbers, around 1,000 of each type, but two-seater SPADs were much less successful than the rival Breguet XIV (5,500 built) and Salmson 2 (3,200 built). Single-seat developments of the SPAD VII were more successful. The SPAD XII was a minor variant, the first to use the geared Hispano-Suiza V-8 engine, which allowed it to be armed with a 37 mm Hotchkiss cannon (moteur-canon) firing through the propeller hub. Tested successfully by ace Georges Guynemer, the general conclusion on the SPAD XII is that only very skillful pilots could exploit its powerful armament. Accordingly, although 300 were ordered, most were completed as normal SPAD fighters, with definitely one (flown by Charles J. Biddle while with the USAAS' 13th Aero Squadron) and possibly two of the SPAD XII aircraft even served with the US Air Service in France.

The SPAD S.XIII was essentially the SPAD S.VII redesigned around a more powerful geared drive Hispano-Suiza engine, as used on the SPAD XII. This was produced in even greater numbers: the exact total is uncertain, with figures from 7,300 to 8,472 being quoted by different sources. Single-seat SPADs were flown by many ace pilots, including Italy's Count Francesco Baracca and the United States Army Air Service's Capt. Eddie Rickenbacker, with 34 and 26 victories respectively. Georges Guynemer was, as has already been noted, highly successful with the SPAD S.XII, as well as the SPAD S.VII and SPAD S.XIII. At the end of the First World War, all 1,152 single-seat fighters on the strength of French front line air units were SPAD S.XIIIs. It is reported that nearly 900 SPAD XIII fighters were eventually to end up in American service.

Although SPAD had been successful, and had produced very large profits, the very high profits in aircraft manufacturing had led to increased competition during the war. In 1916, for example, over 98% of the SPAD fighters built had come from factories owned by SPAD and Blériot. By 1918, with large industrial syndicates competing for contracts, this had fallen to 43%. SPAD designs accounted for around 20% of French aircraft produced during World War One. Louis Blériot's 1913 investment was a very profitable one.

Blériot-SPAD

Post-war the company became Blériot-SPAD. The first of its designs to be known by this name was Bécherau's elegant monocoque SPAD 20 biplane. First flown in 1918, the SPAD 20 was not delivered until 1920. The return of peace meant orders were small; only 93 were built.

The return of peace also meant that the company had to face the problem of dealing with its liabilities under the excess profits tax of 1 July 1916. As modified in 1917, this imposed an 80% tax rate on almost all "excess profits". The calculation and collection of the tax was a controversial issue, and very large amounts were still outstanding as late as 1940, when the German occupation rendered the whole question irrelevant. With the future uncertain, SPAD was fully incorporated into the Blériot organisation in 1921, and the company effectively disappeared, although a number of Blériot types were marked as SPADs.

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Source : Article Deperdussin Monocoque of Wikipedia ( authors )

Deperdussin Monocoque

  • Role : Racer.
  • Manufacturer : Société Pour les Appareils Deperdussin (SPAD).
  • Designer : Louis Béchereau.
  • First flight : 1912.

    • Specifications (1913 Gordon Bennett winner)

  • Crew : 1.
  • Length : 6 m (20 ft).
  • Wingspan : 6.65 m (21 ft 10 in).
  • Wing area : 9.66 m² (104 sq ft).
  • Gross weight : 612 kg (1,350 lb).
  • Maximum speed : 209 km/h; 113 kn (130 mph).
  • Powerplant : One Gnome Lambda air cooled 14-cylinder two-row rotary.
  • Power : 160 hp (120 kW).
  • Propeller : 2-bladed Chauvière, 2.31 m (7 ft 7 in) diameter.

— — — = = — — —

This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Deperdussin Monocoque of Wikipedia ( authors )
Deperdussin Monocoque : Your comments on this subject
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