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The Armstrong Siddeley Jaguar was an aircraft engine developed by Armstrong Siddeley. The Jaguar was a petrol-fuelled air-cooled 14-cylinder two-row radial engine design. The Jaguar III was first used in 1923, followed in 1925 by the Jaguar IV and in 1927 by the Jaguar VI. In 1925 the Jaguar became the first production aero engine incorporating a geared supercharger.[1]

Jaguar
Armstrong Siddeley Jaguar IV
Type	Radial engine
National origin	United Kingdom
Manufacturer	Armstrong Siddeley
First run	21 June 1922

Design and development

The Jaguar was developed from the Royal Aircraft Factory RAF.8 design proposal of 1917, and was engineered to use a gear-driven supercharger. First run on 21 June 1922 initial performance was not as expected; as a result the stroke was increased to 5.5 in (139.7 mm) on all variants after the Jaguar I. Throughout its career the Jaguar suffered from vibration due to a lack of a crankshaft centre bearing.[2]

The most powerful version of the engine, the Jaguar VIC, produced a maximum of 490 hp (365 kW) on takeoff at 1,950 rpm and weighed 910 lb (413 kg).[3] The later Lynx was designed using one row of Jaguar cylinders.[4]

Variants

Jaguar I

1922, 300 hp.

Jaguar II

1923, 385 hp, increased stroke, capacity 1,512 cu in (24.8 L).

Jaguar III

1923, 385 hp.

Jaguar IIIA

1923, 380 hp.

Jaguar IV

1925, 385 hp, twin carburettors

Jaguar IVA

420 hp, Geared propeller drive.

Jaguar IVC

1928, 400 hp, revised connecting rod design, enclosed valve gear.

Jaguar IV(S)

1925, 365 hp, fully supercharged.[nb 1]

Jaguar V

1928.

Jaguar VI

1927.

Jaguar VI(S)

1928, supercharged version of Jaguar VI.

Jaguar VIC

1927, 470 hp, geared propeller drive version of Jaguar VI.

Jaguar VID

1928.

Jaguar VIIA

1929, 400 hp, fully supercharged.

Jaguar VIII

1928, 405 hp, fully supercharged, geared propeller drive

Applications

Engines on display

A preserved Armstrong Siddeley Jaguar is on public display at the Science Museum (London).

Specifications (Jaguar I)

Data from Lumsden[6]

General characteristics

• Type: 14-cylinder 2-row radial engine
• Bore: 5 in (127 mm)
• Stroke: 5 in (127 mm)
• Displacement: 1,375 cu in (22.5 L)
• Length: 41 in (1,041 mm)
• Diameter: 43 in (1,092 mm)
• Dry weight: 710 lb (322 kg)

Components

• Supercharger: Gear driven
• Fuel system: Carburettor
• Cooling system: Air-cooled

Performance

• Power output: 300 hp (224 kW)
• Compression ratio: 5:1
• Fuel consumption: 19 gal/hr (71 L/hr) at cruise
• Power-to-weight ratio: 0.42 hp/lb (0.7 kW/kg)

See also

Related development

• Armstrong Siddeley Lynx

Comparable engines

• Cosmos Mercury

• Bristol Jupiter

Related lists

• List of aircraft engines

References

Notes

Footnotes

Bibliography

External links

• Virtual aviation museum
• The Siddeley "Jaguar"s' 17,000 Miles - a 1926 Flight article on the Jaguar's endurance during an London-Cape Town-London flight by Alan Cobham

На других языках

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[de] Armstrong Siddeley Jaguar

Der Armstrong Siddeley Jaguar ist ein Flugmotor, den der britische Hersteller Armstrong Siddeley ab 1922 baute. Der luftgekühlte zweireihige 14-Zylinder-Sternmotor hat Hubräume von 22.532 bis 24.785 cm³. Der Jaguar III kam 1923, der Jaguar IV 1925 und der Jaguar VI 1927.

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- [en] Armstrong Siddeley Jaguar

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[fr] Armstrong Siddeley Jaguar

Le Armstrong Siddeley Jaguar est un moteur d'avion fabriqué par Armstrong Siddeley. Le Jaguar est un moteur à explosion à 14 cylindres en double étoile et refroidi par air. Le Jaguar III a été utilisé en 1923 suivi en 1925 par le Jaguar IV et en 1927 par le Jaguar VI.

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[it] Armstrong Siddeley Jaguar

L'Armstrong Siddeley Jaguar fu un motore aeronautico radiale a 14 cilindri doppia stella raffreddato ad aria sviluppato dall'azienda britannica Armstrong Siddeley nei tardi anni dieci ed avviato alla produzione in serie il decennio successivo.

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[ru] Armstrong Siddeley Jaguar

Armstrong Siddeley Jaguar — британский поршневой 14-цилиндровый двухрядный авиадвигатель воздушного охлаждения, разработанный в 1922 году.

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