Armstrong Siddeley Jaguar

Jaguar

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

The Armstrong Siddeley Jaguar was an aero 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.

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 bore was increased to 5.5 in (139.7 mm), with all variants after the Jaguar I using this dimension. Throughout its career the Jaguar suffered from vibration due to a lack of a crankshaft centre bearing.^[1]

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).^[2] The later Lynx was designed using one row of Jaguar cylinders.^[3]

Variants

Jaguar I: 1922, 300 hp.
Jaguar II: 1923, 385 hp, increased bore, capacity 1,512.5 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)

Sectioned Armstrong Siddeley Jaguar on display at the Science Museum (London)

Data from Lumsden^[5]

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: 680 hp (507 kW)
Compression ratio: 5:1
Fuel consumption: 19 gal/hr (71 L/hr) at cruise
Power-to-weight ratio: 0.95 hp/lb (1.6 kW/kg)

References

Notes

↑ Lumsden 2003, p. 63.
↑ Lumsden 2003, Part 4 - Engine Performance Figures.
↑ Gunston 1989, p. 18.
↑ "Development of the Aircraft Supercharger". Flightglobal Archive.
↑ Lumsden 2003, pp. 63–66.

Footnotes

↑ MS and FS refer to the supercharger blower speeds: Moderate/Fully Supercharged. Moderate Supercharging referred to low- to medium-altitudes operation, Full Supercharging to medium- to high-altitude operation^[4]

Bibliography

Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links

Wikimedia Commons has media related to Armstrong Siddeley Jaguar.

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

Armstrong Siddeley aero engines
Piston engines	Boarhound Cheetah Civet Cougar Deerhound Genet Genet Major Hyena Jaguar Jaguar Major Leopard Lynx Lynx Major Mongoose Ounce Panther Puma Serval Tiger (V12) Tiger (Radial) Wolfhound
Turbojets	Adder ASX Sapphire Viper
Turboprops	ASP Double Mamba Mamba Python
Rocket engines	Beta Snarler Screamer Stentor Gamma

Royal Aircraft Factory aero engines
RAF 1 RAF 2 RAF 3 RAF 4 RAF 5 RAF 7 RAF 8

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