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Armstrong Siddeley Jaguar



The Jaguar was developed from the Royal Aircraft Factory RAF.8 design proposal of 1917, and was engineered to use a gear driven supercharger. The Jaguar was a petrol-fuelled air-cooled 14-cylinder two-row radial engine design. 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.

The Jaguar III was first used in 1923, followed in 1925 by the Jaguar IV and in 1927 by the Jaguar VI. 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 lbs (413 kg). The later Lynx was designed using one row of Jaguar cylinders.


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.

Jaguar V

Jaguar VI

Jaguar VI(S)
1928, supercharged version of Jaguar VI.

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

Jaguar VID

Jaguar VIIA
1929, 400 hp, fully supercharged.

Jaguar VIII
1928, 405 hp, fully supercharged, geared propeller drive


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Jaguar I

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


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