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Voisin X

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Voisin X/10/LAR/LBR/E.54
Role Night Bomber & Reconnaissance
Manufacturer Voisin
Designer Gabriel Voisin
First flight 1917
Introduction 1917
Primary user France Aéronautique Militaire
Number built approx 900 LAR & LBR built.
Developed from Voisin VIII

The Voisin X was a French two-seat biplane pusher which was built in two versions, one fitted with a 37mm Hotchkiss cannon (the LBR or Ca.2), and the other as a conventional night bomber (the LAR or Bn.2). Problems with the Peugeot engine in the previous Voisin VIII led to the installation of a new Renault engine of greater power and reliability, but the new aircraft was otherwise nearly identical to the VIII.[1] Despite its obsolescence, it would make up the bulk of front line night bomber escadrilles until the end of the war.

Development

With the failure of the 1915 and 1916 bomber contests to produce any usable types to replace the Voisin V, Voisin was asked to produce an interim type pending the development of the next generation of bombers.[2] This began with the Voisin VII which was itself an enlarged V, but was underpowered[1], and was soon followed by the Voisin VIII, which suffered severe reliability problems. As with the VIII, two versions were to be built, a night bomber, and an aircraft armed with a large single shot 37mm Hotchkiss cannon .[2] By the time the X appeared, the cannon had been found to be of little use and most of those built as LBR/Ca.2s were converted to bombers with the cannons removed. Those LBRs still fitted with the cannon had the pilot in the rear seat, while in the LAR, the pilot sat in the front seat, while the rear occupant could be equipped with a light machine gun such as a Lewis. On some aircraft, the observer's gun was mounted on a ring that was inclined forward to make movement forward easier against the wind.

Like the previous Voisins going back to the Voisin III, the Voisin VIII had a steel tube structure to provide adequate strength, covered with aluminium sheet on the fuselage nacelle and doped fabric on the flying surfaces. The fuselage was a square box to which no attempt was made at reducing drag. The 3-bay wings had a constant chord and square tips, and the top wings were slightly longer than the lower wings. The cruciform tail was mounted on booms that tapered in plan view only to a vertical knife edge that formed the rudder post. The all-flying rudder and elevator were aerodynamically balanced and had no fixed flying surfaces. Unusually for the period, and because it had no skid to drag it to a stop, it was equipped with drum brakes on the rear wheels.[2] Like the Voisin VIII, the X was fitted with two large strut mounted teardrop fuel tanks that could be jettisoned in the event of a fire.[1] Also, as with the VIII, the X was usually fitted with tall individual exhaust stacks projecting above the top wing. Due to the change from a V-8 to a V-12 there were additional stacks, and some examples had a muffler installed. A small additional aerodynamic counterbalance was sometimes also added at the bottom of the rudder.

Operational history

Aerochir

While the British and Americans experimented with aerial ambulances, carrying a single stretcher in a Curtiss Jenny or Airco DH.4, in France, a Voisin X was converted into a complete mobile flying hospital, the Aerochir, complete with X-ray machines and other modern equipment for a full service operating room, so as to better support the mobile battlefield conditions created by the introduction of tank warfare.

Drone/autopilot

In 1918, a Voisin X made a fully automated 100km flight without human assistance.[3] A pilot was carried as a backup but wasn't found to be necessary[3]. Four Sperry gyroscopes actuated electrical servo motors which controlled the flight surfaces and the engine throttle[3]. During the flight, it changed altitude and direction multiple times, based on a preprogrammed course set with a series of switches[3]. Testing resumed in 1923, for intended use as an auto-pilot[3].

French service

The first Voisin X's entered service with VB114 in late 1917.[4]

Beginning in July 1918, the Voisin was supplemented by the Farman F.50 in French front-line service, with surviving examples being transferred to newly created second line units.[5]

Variants

Fuselage to a Voisin X/LBR at the Musée de l'air et de l'espace showing the 37 mm (1.457 in) cannon
Voisin X
  • 280 hp (210 kW) Renault 12Fe
    • Voisin LAR - factory designation for X night bomber
    • Voisin LBR - factory designation for X armed with 37 mm (1.457 in) cannon
Voisin XI
  • Variant of X with 350 hp (260 kW) Panhard 12Bc and minor changes to proportions but only around 10 built

Operators

 France
 Czechoslovakia
  • four examples used by 4 Letecka Setnina and Letecke Dilny, both at Cheb postwar.[7]
 United States

Survivors/Aircraft on display

Specifications

Voisin 10 3 view plan

Data from French Aircraft of the First World War[8]

General characteristics

  • Crew: 2
  • Length: 10.35 m (33 ft 11 in)
  • Wingspan: 17.90 m (58 ft 9 in)
  • Height: 3.95 m (13 ft 0 in)
  • Wing area: 61.14 m2 (658.1 sq ft)
  • Empty weight: 1,400 kg (3,086 lb)
  • Max takeoff weight: 2,200 kg (4,850 lb)
  • Propellers: 2-bladed Lumière fixed-pitch pusher propeller

Performance

  • Maximum speed: 135 km/h (84 mph, 73 kn) @ 2,000 m (6,600 ft)
  • Range: 350 km (220 mi, 190 nmi)
  • Endurance: 5 hours
  • Time to altitude: 20 minutes to 2,000 m (6,600 ft)

Armament

  • LAR equipped with one machine gun and 300 kg (660 lb) of bombs.
  • LBR equipped with a 37 mm (1.457 in) Hotchkiss cannon

See also

Aircraft of comparable role, configuration, and era

Related lists

References

Notes

Citations

  1. ^ a b c Davilla, p.557
  2. ^ a b c Davilla, p.559
  3. ^ a b c d e de Fouchier, 1978, pp.1-4
  4. ^ a b Davilla, p.563
  5. ^ Davilla, p.565
  6. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap Davilla, p.564
  7. ^ a b Davilla, p.566
  8. ^ Davilla, 1997 pp.563-565

Further reading

Wikimedia Commons has media related to Voisin X.
  • Woodman, Harry (1989). Early Aircraft Armament: The Aeroplane and the Gun Up to 1918. London, UK: Arms & Armour Press. ISBN 978-0853689904.
  • Template:Fr icon Official rigging manual

Bibliography

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