title: Hispano-Suiza 14AA
text: # Hispano-Suiza 14AA
  
  The Hispano-Suiza 14AA, also known as Type 79, was a fourteen-cylinder aircraft radial engine used in France during the late 1930s. As Hispano-Suiza lacked recent experience in developing radial engines, it was derived from the licensed Wright R-2600 engine. Due to reliability problems, the engine was largely supplanted by the similar Gnome-Rhône 14N.
  
  Not to be confused with the smaller Hispano-Suiza 14AB, which was derived from the smaller Wright Whirlwind series.
  
  ## Variants
  
  ### 14AA-00
  
      Direct drive LH rotation
  
  ### 14AA-01
  
      Direct drive RH rotation as -00
  
  ### 14AA-02
  
      0.625:1 reduction gear LH rotation
  
  ### 14AA-03
  
      0.625:1 reduction gear RH rotation as -02
  
  ### 14AA-04
  
      0.625:1 reduction gear LH rotation
  
  ### 14AA-05
  
      0.625:1 reduction gear RH rotation as -04
  
  ### 14AA-06
  
      Direct drive LH rotation
  
  ### 14AA-07
  
      Direct drive RH rotation as -06
  
  ## Applications
  
  * Amiot 341
  * LeO 45
  * Farman F.223
  * Latécoère 530
  * Latécoère 570
  * Koolhoven F.K.58
  * Potez 501
  * Romano R.120
  
  ## Specifications (14AA-04)
  
  Data from Tsygulev.
  
  ### General characteristics
  
  * Type: Fourteen-cylinder two-row supercharged air-cooled radial engine
  * Bore: 155,6 mm (6.126 in)
  * Stroke: 170 mm (6.693 in)
  * Displacement: 45.257 L (2,761 in³)
  * Length: 1,650 mm (64.96 in)
  * Diameter: 1,260 mm (49.61 in)
  * Dry weight: 640 kg (1,411 lb)
  
  ### Components
  
  * Valvetrain: Overhead valves
  * Supercharger: Single-speed centrifugal type supercharger, 10.0:1 reduction
  * Fuel system: Carburetor
  * Fuel type: 85-87 octane rating gasoline
  * Cooling system: Air-cooled
  * Reduction gear: 1.58:1
  
  ### Performance
  
  * Power output: 793 kW (1,063 hp) at 2,125 rpm for takeoff
  * Specific power: 17.52 kW/L (0.39 hp/in³)
  * Compression ratio: 6.2:1
  * Specific fuel consumption: 369 g/(kW•h) (0.61 lb/(hp•h))
  * Oil consumption: 12 g/(kW•h) (0.32 oz/(hp•h))
  * Power-to-weight ratio: 1.24 kW/kg (0.75 hp/lb)
  