Hispano-Suiza 12X

The Hispano-Suiza 12X was an aircraft piston engine designed in France by Hispano-Suiza during the early 1930s. A 12-cylinder Vee, liquid-cooled design, the 12X was used on several aircraft types, some of them being used in limited numbers during World War II. Due to the 12X's limited power output, its derivative the more powerful Hispano-Suiza 12Y had a longer career.

Hispano-Suiza 12Xbrs at the Polish Aviation Museum in Kraków.
Type Vee piston engine
National origin France
Manufacturer Hispano-Suiza


Tabulated data from Lage 2004[1]

Type 72 Hispano-Suiza 12X engines. V-12, bore=130 mm, stroke=170 mm, capacity=27.0 litres.
Model Year Compression Power (hp) @ r.p.m. T-O power (hp) Output reduction Supercharger optimum altitude (m) Weight (kg) Comments
12Xbr (500 hp)19326.46102,2006101.50355Unsupercharged. Rated power (500 hp) less than nominal 610 hp
12Xbrs (500 hp)19325.86502,6506001.54,000370Rated power (500 hp) less than nominal 650 hp
12Xbrg (500 hp)19325.87152,6506701.52,000370Rated power (500 hp) less than nominal 650 hp
12Xbr (600 hp)19346.46002,2006301.5355For this and all later entries in both tables, Rated power = Nominal power = Power
12Xbrs (690 hp)19345.86902,6006601.54,500370
12Xbrs1 (720 hp)19345.87202,6007041.52,750370
12Xdrs19355.86902,6006701.54,000370Left handed
12Xfrs19355.86902,6006701.54,000370Right handed
12Xgrs19355.86902,6006701.54,000370Hamilton propeller, right handed
12Xgrs119375.87202,6001.52,100370Hamilton propeller, right handed
12Xhrs19355.86902,6006701.54,000370Hamilton propeller, left handed
12Xhrs119375.87202,6001.52,100370Hamilton propeller, left handed
12Xirs19355.86902,6006701.54,000370Flat flange propeller, left handed
12Xjrs19355.86902,6006701.54,000370Flat flange propeller, right handed
Type 76 Hispano-Suiza 12X engines with 20 mm calibre Hispano-Suiza 404 cannon between cylinder banks, firing through propeller shaft. Cylinder dimensions as Type 73.
Model Year Compression Power (hp) @ r.p.m. T-O power (hp) Output reduction Supercharger optimum altitude (m) Weight (kg) Comments
12Xcrs (690 hp)19345.86902,6006601.54,500380
12Xers19345.86902,6006601.54,500380Variable-pitch propeller
12Xirs19375.86902,6006601.53,900385Left handed
12Xjrs19375.86902,6006601.53,900385Right handed
12Xirs119375.87202,6007381.52,100385Left handed
12Xjrs119375.87202,6007381.52,100385Right handed
12X 1319376902,6007381.53,900371
Hispano-Suiza 12Xrs


Comparable engines

Specifications (12Xcrs)

Data from [2]

General characteristics

  • Type: Twelve-cylinder supercharged liquid-cooled 60° Vee piston engine
  • Bore: 130 mm (5.12 in)
  • Stroke: 170 mm (6.69 in)
  • Displacement: 27 L (1,648 in³)
  • Length: 1,577 mm (62.09 in)
  • Width: 726 mm (28.58 in)
  • Height: 904 mm (35.59 in)
  • Dry weight: 380 kg (838 lb)



See also

Related lists


  • Danel, Raymond and Cuny, Jean. L'aviation française de bombardement et de renseignement 1918-1940 Docavia n°12, Editions Larivière
  • Lage, Manual (2004). Hispano Suiza in Aeronautics. Warrendale, USA: SAE International. pp. 486–7. ISBN 0-7680-0997-9.
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