14AA
Type	Radial engine
Manufacturer	Hispano-Suiza
First run	1930s
Developed from	Wright R-2600

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.^[1] Due to reliability problems, the engine was largely supplanted by the similar Gnome-Rhône 14N.

It is 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.^[2]

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)