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The Voisin III was a French two-seat pusher biplane of the First World War, designed by Gabriel Voisin in 1914 as a more powerful development of the 1912 Voisin L. A multi-purpose aircraft, it is remembered for two firsts: it equipped the very first units dedicated to bombing, formed in the autumn of 1914, and on 5 October 1914 a Voisin III shot down an enemy aircraft with gunfire for the first time in history. More than 1,350 were built in France, Russia, Italy and Great Britain. It was followed by three close relatives: the cannon-armed Voisin IV, and the more powerful Voisin V and Voisin VI.
The Voisin family used two parallel systems of names, which often causes confusion:
The Voisin L had performed well in the French Army trials of 1912, and the type was selected for mass production when the war broke out. The Voisin III kept the same general layout: a short nacelle carrying the crew, with the engine at the rear driving a pusher propeller, two-bay biplane wings, and an open tail unit carried on four booms. Its robust welded steel-tube structure was unusual for the time and made the aircraft sturdy enough for the improvised airfields at the front. The characteristic four-wheel (quadricycle) landing gear protected it from nosing over on rough ground.
The first aircraft were powered by a 130 hp (97 kW) Salmson M9 (Canton-Unné) nine-cylinder water-cooled radial engine; later examples received the 150 hp (110 kW) Salmson P9 or R9. The pilot sat at the front of the nacelle with the observer behind him. The observer handled the bombs, the camera and the armament, usually a Hotchkiss machine gun mounted on a tripod above the pilot's head, which he fired standing up. Depending on the source and the engine, the bomb load ranged from about 55 kg to 150 kg (120 to 330 lb).
The first aerial victory
On 5 October 1914, Sergeant Joseph Frantz and his mechanic-gunner Corporal Louis Quénault, of Escadrille V 24, attacked a German Aviatik B.I of Feldflieger-Abteilung 18 over Jonchery, near Reims. When their Hotchkiss jammed, Quénault went on firing with a rifle until the German aircraft went down, killing its crew, Oberleutnant Fritz von Zangen and Sergeant Wilhelm Schlichting. It was the first enemy aircraft ever shot down by gunfire from another aircraft; a few weeks earlier, the Russian Piotr Nesterov had brought down an Austrian aircraft, but by ramming it.
The first bomber units
France was the first country to create units devoted solely to bombing. The first bomber group, GB 1 (Groupe de Bombardement 1), was formed in the autumn of 1914 under Commandant Louis de Goÿs with three Voisin escadrilles, VB 1, VB 2 and VB 3 (later VB 101 to VB 103). Further groups followed (GB 2, GB 3 and GB 4), with escadrilles VB 104 to VB 112. Throughout the early months of 1915, GB 1 bombed railway stations, factories and depots with very little opposition. On 26 May 1915, in reprisal for the first German gas attacks, eighteen Voisins of GB 1 raided the BASF chemical works at Ludwigshafen; only one aircraft was lost, that of de Goÿs himself, who was taken prisoner. The future ace Charles Nungesser also began his combat career on Voisin LAS bombers with VB 106, flying 53 missions between April and September 1915.
Like most aircraft of its time, the Voisin III was also used for reconnaissance, artillery spotting, ground attack and training. By 1916, however, it had become slow and vulnerable to the new German fighters such as the Fokker Eindecker. Losses mounted and the Voisins were withdrawn from daylight operations and restricted to night bombing, before being replaced by the Voisin V and later types.
Belgium
An agreement for the delivery of seven Voisins was signed on 5 January 1915 between Commandant Emile Mathieu, head of the Belgian Compagnie des Aviateurs, and the French Colonel André Bouttieaux. The first Voisin 3 LA was ferried from Issy-les-Moulineaux to the Ten Bogaerde airfield (Sint-Idesbald, near Koksijde) on 25 February 1915. By early May 1915, six aircraft powered by the 130 hp Salmson were in service with Escadrille III, commanded by Lieutenant R. Dhanis, and eleven more were ordered on 3 March 1915, with deliveries starting in July. The Belgian Voisins kept their original French "V" serials and flew reconnaissance, artillery spotting and bombing missions. Among the crews was the future ace Edmond Thieffry.
Russia and other users
Russia was by far the largest foreign user: about 800 Voisins were ordered from France and some 400 more were built under licence by Dux in Moscow, Anatra in Odessa, Lebedev, Breshnev-Moller and Schetinin. Russian Voisins were used until the Revolution, and the Red Air Fleet kept flying the survivors until 1925; a few were operated on skis during the winter. In Italy, the Voisin III was built under licence by the Società Italiana Transaerea (SIT) and equipped several squadriglie. Fifty were built in Great Britain by Savages of King's Lynn for the Royal Flying Corps and the Royal Naval Air Service. Romania received eight aircraft, and the type also served in Serbia and Ukraine. One aircraft which force-landed in Switzerland in 1915 was taken over by the Swiss Fliegerabteilung.
Developed in 1915, the Voisin IV differed from earlier Voisin combat aircraft in carrying a 37 mm Hotchkiss cannon (some sources also mention a 47 mm gun) in the nose of the nacelle. To compensate for the weight of the gun, the upper wing was staggered forward. About 200 were built. Intended to attack aircraft, balloons and ground targets, the cannon-armed Voisins had little success in air combat, being too slow, and in service some had their cannon removed. On 3 February 1915, a Voisin LB of GB 2 based at Saint-Pol-sur-Mer landed by mistake near Kats, on Noord-Beveland, and was interned by the neutral Netherlands.
The payload of the Voisin III was limited by its 130 hp Salmson engine. As an interim solution, Voisin fitted the 150 hp Salmson P9, mounted higher on a platform and tilted to give a slightly downward line of thrust (hence the S of LAS, for surélevé). The airframe and landing gear were strengthened, the nacelle was streamlined, the wing chord was increased and the exhaust was improved. The Voisin V entered service in 1915 and soon replaced the Voisin III on the production lines; about 300 to 350 were built. The crews were not impressed: the "Voisin 150 hp", as they were known at the front, carried only a slightly larger load and were only 13 km/h faster. Like all Voisins, their pusher layout left them defenceless against attacks from the rear. They served alongside the Voisin III in front-line escadrilles until well into 1916, then in night bombing and training units.
The Voisin VI, which appeared in 1916, was a further development of the V with a 155 hp Salmson engine. The gain was again marginal: the maximum speed reached only about 113 km/h and the rate of climb suffered from the extra weight. As the basic design was considered obsolete, only about 50 were built. One Voisin of this family received a second Salmson engine in the nose driving a tractor propeller, probably to test a push-pull layout for a new bomber; it flew in early 1916 but was not developed further.
The Voisin line continued with the larger Voisin VII, then with the Voisin VIII and Voisin X night bombers, which remained in service until the end of the war, while the Breguet XIV took over day bombing from 1917.
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