Panther/Jaguar Major
Type	Radial engine
National origin	United Kingdom
Manufacturer	Armstrong Siddeley
First run	1929
Major applications	Fairey Gordon

The Armstrong Siddeley Panther was a 27-litre 14-cylinder twin-row air-cooled radial aero engine developed by Armstrong Siddeley. It was originally named the Jaguar Major.^[1]

Variants

AS Panther IIIA

500 hp (370 kW)

AS Panther VII

638 hp (478 kW) at 2,400 rpm with 0.5 psi (3.5 kPa) boost

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
• Svenska Aero Jaktfalken (SA-14E)
• Westland Wapiti V (first prototype)

Specifications (Panther VII)

Data from ^[2]

General characteristics

• 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)

Components

• Valvetrain: Overhead valve
• Supercharger: Centrifugal
• Fuel system: Carburettor
• Cooling system: Air-cooled

Performance

• 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)