The Armstrong Siddeley Lynx is a British seven-cylinder aero engine developed by Armstrong Siddeley. It was developed as a single row version of the two-row Armstrong Siddeley Jaguar. Testing began in 1920 and 6,000 had been produced by 1939. In Italy Alfa Romeo built a 200 horsepower (150 kW) licensed version of this engine named the Alfa Romeo Lynx.
Contents
Variants
Lynx I
1920, 150 hp (110 kW).
Lynx II
1920, 184 hp (137 kW).
Lynx III
1924, 200 hp (150 kW).
Lynx IV
1929, 180 hp (130 kW).
Lynx IVA
1930, 188 hp (140 kW).
Lynx IVB
1930, 215 hp (160 kW).
Lynx IVC
1929, 208 / 225 hp (155 / 168 kW).
Lynx IV(G)
1929, Geared propeller drive.
Lynx IV(MOD)
1929, 188 hp (140 kW), reconditioned and modified Lynx IV.
Lynx IV(S)
1928, 200 hp (150 kW), fully supercharged.
Lynx V (Lynx Major)
1930, increased bore and stroke, name changed from Lynx V to Lynx Major then Cheetah, half a Panther
Piaggio P.II
Licence production in Italy by Piaggio.
Applications
Alfa Romeo Lynx
Breda Ba.19
Breda Ba.25
IMAM Ro.10
Survivors
Avro Tutor, K3215, powered by a Lynx IV, flies regularly at the Shuttleworth Collection and can be viewed in the museum at other times.
Specifications (Lynx IV)
Data from Lumsden
General characteristics
Type: 7-cylinder air-cooled radial engine
Bore: 5.0 in (127 mm )
Stroke: 5.5 in (140 mm)
Displacement: 756 cu in (12.4 L)
Length: 45.6 in (1,158 mm)
Diameter: 42 in (1,067 mm)
Dry weight: 525 lb (238 kg )
Components
Valvetrain: Overhead valve, 2 valves per cylinder
Fuel system: Carburettor
Cooling system: Air-cooled
Performance
Power output: 187 hp (139 kW) at 1,700 rpm cruise / 215 hp (160 kW) at 1,900 rpm max
Power-to-weight ratio: 0.35 hp/lb (0.6 kW/kg)