Hispano-Suiza 14AA
# 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)
