page_title: Bréguet 20 Leviathan
section_title: Bréguet XX and Bréguet XXI
hierarchical_section_title: Bréguet 20 Leviathan / Development and design / Bréguet XX and Bréguet XXI
caption_attribution_description: Français&#160;: Moteur Breguet Bugatti 32B 1000 CV (1925) 32 cylindres, Musée de l'Air et de l'Espace, Paris Le Bourget (France) English: Aircraft engine Breguet Bugatti 32B 1000 HP (1925), Museum of Air and Space Paris, Le Bourget (France)
context_page_description: The Bréguet Leviathan was a family of large all-metal biplane aircraft built in France in the early 1920s. The Bréguet XX and XXI were notable for being powered by Bréguet-Bugatti multiple engines, in two forms. The Bréguet XXI was powered by individual Bréguet-Bugatti U.16 engines initially and Lorraine-Dietrich 8b engines in tandem later. The Bréguet XXII had accommodation for about twenty passengers and was destroyed during a 1923 transport aircraft competition. Development of all three aircraft types was halted largely due to technical issues with power-plants and aircraft structure.
context_section_description: In 1922 Bréguet Aviation flew both their all-metal Bréguet 19, a bomber/reconnaissance aircraft and the Bréguet XX. The latter was another all-metal biplane but much larger and powered by a Bréguet-Bugatti 32A Quadimoteur Type A, (two Bréguet-Bugatti U.24 engines mounted in tandem on a cradle, driving a single output shaft), with a single output shaft, for the first time on 20 June 1922. The engine assembly was placed in the forward fuselage and drove the nose-mounted single propeller via a shaft running through the forward engine half's cylinder banks from the combining gearbox between the two engine halves.
  A bomber variant, the Bréguet XXI, was also built with limited success; the partially built fuselage was displayed at the 1921 Paris Aero Salon, clearly showing the installation of the Bréguet-Bugatti 32A Quadimoteur Type A engine. The Bréguet XXI was later fitted with a Bréguet-Bugatti 32B Quadimoteur Type B, which grouped four 8-cylinder banks around a combining gearbox in an 'H' configuration.
caption: The sole Bréguet-Bugatti 32B Quadimoteur Type B with Bréguet XXI engine mounting frame on display at the Musée de l'Air et de l'Espace, Paris Le Bourget
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