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|Role||biplane cannon-armed fighter|
|First flight||5 July 1917|
|Primary users||Aéronautique Militaire
|Number built||unknown, 300 ordered|
|Developed from||Spad S.VII|
The SPAD S.XII or SPAD 12 was a French single-seat biplane fighter aircraft of the First World War developed from the successful SPAD 7 by Louis Béchereau, chief designer of the Société Pour L'Aviation et ses Dérivés (SPAD).
The SPAD XII was inspired by the ideas of French flying ace Georges Guynemer, who proposed that a manoeuvrable single-seat aircraft be designed to carry a 37 mm cannon, a weapon which had previously been mounted only in large two-seat "pusher" aircraft such as the Voisin III. Béchereau took his own SPAD 7 design as the starting point, but the many major and minor changes incorporated into the SPAD 12 made it a quite different aircraft.
The gun chosen for the SPAD XII was not the old Hotchkiss cannon but a new 37 mm Semi Automatique Moteur Canon (SAMC), built by Puteaux, for which 12 shots were carried. The Hispano-Suiza aviation engine had to be geared to allow the gun to fire through the propeller shaft. The SPAD XII also carried a single 0.303 inch synchronized (7.7 mm) Vickers machine gun mounted on the starboard side of the nose. In order to carry the heavy cannon the airframe was lengthened and the wingspan and wing area increased. The wingtips were rounded rather than squared off and the wings given a slight forward stagger. To accommodate the required geared output propshaft engine, which easily allowed for the hollow propeller shaft for the cannon to fire through, and power the resultingly heavier airframe, 587 kg compared to the 500 kg of the SPAD 7, the 180 bhp Hispano-Suiza 8 direct-drive Ab engine was replaced by the geared 220 bhp model 8Cb, and gave the SPAD XII a clockwise rotating propeller, as seen from a "nose-on" view.
Test flown by Guynemer, the early production models of the SPAD XII were highly successful after overcoming initial problems with the reduction gear between engine and propeller. Other aces also had success with the new model. However, deliveries were slow, the SPAD VII and later SPAD XIII having top priority, and even the modest total of 300 aircraft which were ordered were not all completed. Best estimates are only 20 produced. Average pilots found the SPAD 12 a difficult aircraft to master, and the cannon difficult to aim and fire, while manual reloading was difficult. The cockpit filled with fumes upon every firing. Its breech mechanism protruded into the cockpit and prevented the use of a conventional stick to control the aircraft, adding to the difficulties encountered by ordinary pilots. The control setup reverted to a split setup on either side of the pilot, a la Deperdussin.
No units were entirely equipped with SPAD 12s. The unknown number of aircraft produced were issued in small numbers, intended for use only by the most skilled pilots, such as Rene Fonck, Lionel de Marmier, Fernand Henri Chavannes, Henri Hay de Slade, Albert Deullin and François Battesti. They were distributed one or two per squadron. Few were delivered to combat units, 8 being recorded on strength in April and again in October; this may be contrasted with the thousands of SPAD 7s and SPAD 13s in service. Single examples for testing were delivered to the Royal Flying Corps and one to the Aviation Section of the American Expeditionary Force, with the AEF's 13th Aero Squadron receiving the aircraft, which was given the number "0", and primarily flown by the 13th's Charles John Biddle , who ended up with a total of seven confirmed victories in World War I.
- Royal Flying Corps - One aircraft only.
- American Expeditionary Force - One aircraft only, serving with 13th Aero Squadron.
- Yugoslav Royal Air Force - Postwar
Data from The Complete Book of Fighters 
- Crew: 1
- Length: 6.40 m (21 ft 0 in)
- Wingspan: 8.00 m (26 ft 3 in)
- Height: 2.55 m (8 ft 4½ in)
- Wing area: 20.2 m² (217 sq ft)
- Empty weight: 587 kg (1,295 lb)
- Loaded weight: 883 kg (1,947 lb)
- Max. takeoff weight: 834 kg (1,840 lb)
- Powerplant: 1 × Hispano-Suiza 8Cb V-8 water-cooled engine, 164 kW (220 hp)
- Maximum speed: 203 km/h (110 knots, 126 mph)
- Endurance: 1¾ h
- Service ceiling: 6,850 m  (22,470 ft)
- Climb to 2,000 m (6.560 ft): 6 min 3 s
- Related development
|Wikimedia Commons has media related to SPAD.|
- "The Cannon Pioneers".
- SPAD XII/XIII aces of World War I. pp. 7, 9.
- SPAD XII/XIII aces of World War I. pp. 8–9.
- SPAD XII/XIII aces of World War I. pp. 9–10.
- Bruce 1982, p.560.
- Green and Swanborough 1994, p.542-543.
- Taylor, John W. R., and Jean Alexander. "Combat Aircraft of the World" New York: G.P. Putnam's Sons, 1969 Library of Congress Catalog Card Number 68-25459 (Pg.127)
- Bruce, J.M. The Aeroplanes of the Royal Flying Corps (Military Wing). London:Putnam, 1982. ISBN 0-370-30084-X.
- Davilla, James J., & Soltan, Arthur M., French Aircraft of the First World War. Stratford, Connecticut: Flying Machines Press, 1997. ISBN 0-9637110-4-0.
- Green, William and Swanborough, Gordon. The Complete Book of Fighters. New York: Smithmark, 1994. ISBN 0-8317-3939-8.
- Guttman, Jon, SPAD XII/XIII aces of World War I. Osprey Publishing, 2002. ISBN 1841763160, 9781841763163.