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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

Applications:

Armstrong Whitworth Atlas Mk II
Armstrong Whitworth A.W.XIV Starling MkII
Armstrong Whitworth A.W.16
Armstrong Whitworth A.W.35 Scimitar
Fairey Gordon
Fokker C.V
Hawker Hoopoe
Marinens Flyvebaatfabrikk M.F.11
Supermarine Air Yacht
Westland Wapiti V (first prototype)

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/sq.in

Min permissible oil pressure: 30 lb/sq.in

Oil release valve lifts at: 65 lb/sq.in

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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