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The Gnome-Rhône 7K Titan Major was a seven-cylinder 370 hp (270 kW) air-cooled radial engine, that started life as an enlarged Gnome-Rhône 5K with two extra cylinders.

7K
Type	Radial engine
Manufacturer	Gnome et Rhône

Development

The Gnome-Rhône 5K was itself a licensed version of the Bristol Titan. The 7K is very comparable to the Bristol Neptune seven-cylinder engine since they used the same technology.[1] The 7K was followed by the larger and more powerful nine-cylinder 550 hp (405 kW) Gnome-Rhône 9K Mistral. Gnome-Rhône later responded to the need for a more powerful engine by developing the 7K into a two-row version that became the Gnome-Rhône14K Mistral Major.

Variants

IAM K7

Licence production in Yugoslavia by Industrija Aeroplanskih Motora- Rakovica (IAM).

IAR 7K

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

Applications

Specifications (7Kd)

Data from [2]

General characteristics

• Type: Seven-cylinder air-cooled radial engine.
• Bore: 146 mm (5.75 in)
• Stroke: 165 mm (6.50 in)
• Displacement: 19.3 l (1,180 cu in)
• Length: 146 mm (5.75 in)
• Diameter: 1,235 mm (48.62 in)
• Dry weight: 270 kg (600 lb)

Components

• Valvetrain: Pushrod operated over-head valves, two per cylinder
• Supercharger: (7Ksd - single speed centrifugal blower)
• Fuel system: Carburetor
• Fuel type: Gasoline
• Cooling system: Air-cooled

Performance

• Power output: 7Kd - 260 kW (350 hp) at 2,000 rpm at sea level for take-off

  7Ksd - 272 kW (365 hp) at 2,000 rpm at 1,500 m (4,900 ft)

  7Ksd - 250 kW (340 hp) at 2,000 rpm at 4,000 m (13,000 ft)

• Compression ratio: 5.5:1

See also

Related development

• Bristol Neptune
• Piaggio Stella P.VII

Comparable engines

• Armstrong Siddeley Cheetah
• Armstrong Siddeley Lynx
• Jacobs R-915

Related lists

• List of aircraft engines

References

Notes

Bibliography

На других языках

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- [en] Gnome-Rhône 7K

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[it] Gnome-Rhône 7K

Lo Gnome-Rhône 7K "Titan Major" motore aeronautico radiale a 7 cilindri facente parte di una famiglia di motori denominata "serie K" che la casa francese Gnome-Rhône realizzò sviluppando il progetto del britannico Bristol Titan a 5 cilindri che produceva su licenza. La serie comprendeva anche lo Gnome-Rhône 5K Titan a 5 cilindri, il 9K Mistral a 9 cilindri ed il 14K Mistral Major a 14 cilindri. Questi motori erano caratterizzati dalla modularità del progetto, ovvero dalla intercambiabilità dei principali componenti meccanici quali l'albero a gomito, i cilindri completi, i pistoni, gli alberi ed coperchio posteriore. In questo modo si poteva realizzare una gamma di motori che potessero occupare più fasce di potenza contenendo costi di produzione e magazzino.

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[ru] Гном-Рон 7K Titan Major

Гном-Рон 7K Titan Major — французский поршневой звездообразный 7-цилиндровый авиадвигатель воздушного охлаждения 1930-х годов.

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