Gnome-Rhône 14N
The 14N was a 14-cylinder two-row air-cooled radial engine designed and manufactured by Gnome-Rhône. A development of the pre-war Gnome-Rhône 14K, the 14N was used on several French and German aircraft of World War II.
Design and development
Facing criticisms over the 14K's reliability, Gnome-Rhône undertook a major upgrade of its 14-cylinder design, using different materials for the pistons and valves, and enlarging cooling surfaces by 39%.
The new 14N was introduced in 1937 and was quickly adopted on several aircraft models. In 1939, minor improvements allowed Gnome-Rhône to increase the compression ratio from 6.1:1 to 6.8:1, which resulted in increased power for wartime production aircraft.
The 14N was further developed into the Gnome-Rhône 14R featuring a 2-stage supercharger, but this type was not widely used until after World War II as production of improved engines was prohibited by the terms of the armistice with Germany.
Applications
Specifications (14N 48/49)
General characteristics
- Type: Fourteen-cylinder two-row air-cooled piston engine
- Bore: 146 mm (5.74 in)
- Stroke: 165 mm (6.49 in)
- Displacement: 38.67 L (2,360 in³)
- Length: 1.48 m (66 in)
- Diameter: 1.29 m (50.8 in)
- Height: 1,289 mm (50.75 in)
- Dry weight: 620 kg (1,370 lb)
Components
Performance
- Power output:
- 868 kW (1,164 hp) at 2,650 rpm for takeoff
- 728 kW (976 hp) at 2,400 rpm at sea level
- 780 (1,045 hp) at 2,400 rpm at 4,800 m (15,750 ft)
- Specific power: 22.45 kW/l (0.49 hp/in³)
- Compression ratio: 6.8:1
- Power-to-weight ratio: 1.4 kW/kg (0.85 hp/lb)
See also
References
- Danel, Raymond and Cuny, Jean. L'aviation française de bombardement et de renseignement 1918-1940 Docavia n°12, Editions Larivière
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