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The Gnome-Rhône 9K Mistral was a nine-cylinder 550 hp (405 kW) to 700 hp air-cooled radial engine, that started life as an enlarged Gnome-Rhône 7K with two extra cylinders.

9K
Type	Radial engine
Manufacturer	Gnome et Rhône
Developed into	Piaggio Stella P.IX

Design and development

The Gnome-Rhône 7K itself was an enlarged version of the Gnome-Rhône 5K which was derived from a licensed version of the Bristol Titan. A redesign of the cylinders is indicated by the K suffix. The 9K was followed by the larger and more powerful 14-cylinder twin row Gnome-Rhône 14K.

The 9K was license produced by Hungarian company Weiss Manfréd Repülogép- és Motorgyár Rt. (WM Rt, the aircraft engine factory of Manfred Weiss). The engine was used successfully in the MÁVAG Héja and Weiss WM-21 Sólyom aircraft. The 9K was also produced in the Soviet Union as the M-75 at GAZ-29 in Zaporozhye. Only small numbers were built and it was dropped in favor of the M-25 a version of the Wright Cyclone and the M-85 a version of the Gnome-Rhône 14K Mistral Major.

Variants

9K

9Kbr

9Kdr

9Kdrs

9Kers

9Kfr

I.A.R. 9KIc40

Licence production in Romania by Industria Aeronautică Română (IAR).

Applications

• Breguet Calcutta
• IAR-15
• Loire 70
• Morane-Saulnier M.S.225
• SNCAC NC.510
• Wibault 313
• Wibault 365

Specifications (9Kd)

Data from [1]

General characteristics

• Type: Nine-cylinder air-cooled radial engine.
• Bore: 146 mm (5.75 in)
• Stroke: 165 mm (6.50 in)
• Displacement: 24.9 l (1,520 cu in)
• Length: Kdr 0.5 reduction gear - 1,295 mm (50.98 in)

  Kdr 0.666· reduction gear - 1,297 mm (51.06 in)

  Kdrs 0.5 reduction gear - 1,323 mm (52.09 in)

  Kdrs 0.666· reduction gear - 1,325 mm (52.17 in)

• Diameter: 1,299 mm (51.14 in)
• Dry weight: Kdr 0.5 reduction gear - 355 kg (783 lb)

  Kdr 0.666· reduction gear - 360 kg (790 lb)

  Kdrs 0.5 reduction gear - 369 kg (814 lb)

  Kdrs 0.666· reduction gear - 374 kg (825 lb)

Components

• Valvetrain: Two valves per cylinder, pushrod operated
• Supercharger: Kdrsd - single stage centrifugal blower
• Fuel system: Carburetor
• Fuel type: Gasoline
• Cooling system: Air-cooled
• Reduction gear: Direct drive, 0.5:1 or 0.666·:1

Performance

• Power output: Kdr - 370 kW (500 hp) at sea level

  Kdrs - 370 kW (500 hp) at 1,500 m (4,900 ft)

  Kdrs - 340 kW (450 hp) at 4,000 m (13,000 ft)

• Compression ratio: 5.5:1

See also

Related development

• Piaggio Stella P.IX
• Tumansky M-90

Comparable engines

• BMW 132
• Bramo 323
• Bristol Mercury
• Piaggio P.X

Related lists

• List of aircraft engines

References

На других языках

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- [en] Gnome-Rhône 9K

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[it] Gnome-Rhône 9K

Lo Gnome-Rhône 9K Mistral era un motore aeronautico radiale a 9 cilindri raffreddato ad aria prodotto dal 1931, facente parte di una famiglia di motori denominata "serie K" che la casa francese Gnome et Rhône realizzò sviluppando il progetto del britannico Bristol Titan a 5 cilindri che produceva su licenza.[1]

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[ru] Гном-Рон 9K Mistral

Гном-Рон 9K Mistral — французский поршневой 9-цилиндровый авиадвигатель воздушного охлаждения, разработанный в 1931 году.

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