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Armstrong Siddeley Jaguar Major / Panther


The Armstrong Siddeley Panther was a 27-litre 14-cylinder twin-row air-cooled radial aero engine developed by Armstrong Siddeley. First run in 1929, it was originally named the Jaguar Major.


Panther IIA
Panther IIA



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Panther IIA
Type: 2 row 14-cyl radial
Overall diameter: 46.45 in
Length: 31.35 in
Bore 5.25 in
Stroke: 5.5 in
Compression ratio: 5-1
Reduction gear: Epicyclic .657-1
Crankshaft rotation: left hand tractor
Airscrew shaft rotation: left hand tractor
Normal crankshaft rpm: 2000
Max crankshaft rpm: 2300
Rated altitude: 3000 ft
BHP normal rpm 3000 ft: 535
BHP max rpm 3000 ft: 600
Dry weight: 1004 lb
Oil spec: Spec. D.T.D. 109
Oil consumption 90% pwr normal rpm: 12-16 pint/hr
Normal oil pressure: 50 lb/
Min permissible oil pressure: 30 lb/
Oil release valve lifts at: 65 lb/
Min outlet oil temp before flight: 15 deg C
Oil circulation: 3-5 gal/min
Carburetter: 1 x Claudel-Hobson A.V.T.70.H
Fuel consumption 90% pwr: .535 pints/BHP/hr
Spark plugs: 2 x Lodge A2
Plug gap: .012 - .015 in
Magnetos: 2 x B.T.H. SC.14-1A
Firing order: 1R, 2F, 3R, 4F, 5R, 6F, 7R, 1F, 2R, 3F, 4R, 5F, 6R, 7F

Panther VII
Type: 14-cylinder twin-row air-cooled radial engine
Bore: 5.25 in (133.4 mm)
Stroke: 5.5 in (139.7 mm)
Displacement: 1,667 cu in (27.3 L)
Length: 64 in (1.63 m)
Diameter: 46.45 in (1.18 m)
Dry weight: 1,047 lb (475 kg)
Valvetrain: Overhead valve
Supercharger: Fully supercharged
Fuel system: Carburettor
Cooling system: Air-cooled
Power output: 638 hp (478 kW) at 2,400 rpm with 0.5 psi (3.5 kPa) boost
Compression ratio: 5.1:1
Power-to-weight ratio: 0.61 hp/lb (1.01 kW/kg)



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