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Gnome-Rhône 14K Mistral Major

The Gnome-Rhône 14K Mistral Major was a 14-cylinder, two-row, air-cooled radial engine. It was Gnome-Rhône's major aircraft engine prior to World War II, and matured into a highly sought-after design that would see licensed production throughout Europe and Japan. Thousands of Mistral Major engines were produced, used on a wide variety of aircraft.

General characteristics: (14Kd)

• Type: Fourteen-cylinder two-row air-cooled radial engine
• Bore: 146 mm (5.748 in)
• Stroke: 165 mm (6.496 in)
• Displacement: 38.673 l (2,360.0 cu in)
• Length:
• Kds - 1,317 mm (51.85 in)
• Kdr - 0.5 reduction gear - 1,528 mm (60.16 in)
• Kdr - 0.666· reduction gear - 1,530 mm (60.24 in)
• Kdrs - 0.5 reduction gear - 1,554 mm (61.18 in)
• Kdrs - 0.666· reduction gear - 1,556 mm (61.26 in)
• Diameter: 1,288 mm (50.71 in)
• Dry weight:
• Kdr 0.5 reduction gear - 503 kg (1,109 lb)
• Kdr 0.666· reduction gear - 508 kg (1,120 lb)
• Kdrs 0.5 reduction gear - 523 kg (1,153 lb)
• Kdrs 0.666· reduction gear - 528 kg (1,164 lb)
• Kds 502 kg (1,107 lb)

Components

• Valvetrain: Two Overhead valves per cylinder operated by pushrods
• Supercharger: (Kds / Kdrs - Single-speed centrifugal type supercharger)
• Fuel system: Stromberg carburetor
• Fuel type: 87 octane rating gasoline
• Cooling system: Air-cooled
• Reduction gear: Direct drive, 0.5:1 or 0.666·:1

Performance

• Power output:
• Kdr - 600 kW (800 hp) at sea level
• Kdrs - 580 kW (780 hp) at 1,500 m (4,900 ft) at 2,400 rpm
• Kdrs - 510 kW (680 hp) at 4,000 m (13,000 ft) at 2,400 rpm
• Kds - 560 kW (750 hp) at 1,500 m (4,900 ft) at 2,300 rpm
• Kds - 480 kW (650 hp) at 4,000 m (13,000 ft) at 2,300 rpm
• Specific power:
• Kdr 15.5 kW/l (0.34 hp/in³)
• Compression ratio: 5.5:1
• Specific fuel consumption: 328 g/(kW•h) (0.54 lb/(hp•h))
• Oil consumption: 20 g/(kW•h) (0.53 oz/(hp•h))
• Power-to-weight ratio: 1.52 kW/kg (0.92 hp/lb)

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