The Armstrong Siddeley Lynx is a British seven-cylinder aero engine developed by Armstrong Siddeley. 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.
Lynx I
1920, 150 hp.
Lynx II
1920, 184 hp.
Lynx III
1924, 200 hp.
Lynx IV
1929, 180 hp.
Lynx IVA
1930, 188 hp.
Lynx IVC
1929, 208/225 hp.
Lynx IV(G)
1929, Geared propellor drive.
Lynx IV(MOD)
1929, 188 hp, reconditioned and modified Lynx IV.
Lynx IV(S)
1928, 200 hp, Fully supercharged.
Lynx V (Lynx Major)
1930, increased bore and stroke, name changed from Lynx V to Lynx Major then Cheetah. Effectively half a Panther
Piaggio P.II
Licence production in Italy by Piaggio.
Breda Ba.19
Breda Ba.25
IMAM Ro.10
Avro Tutor, K3215, powered by a Lynx IV, flies regularly at the Shuttleworth Collection and can be viewed in the museum at other times.
Data from Lumsden
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 )
Valvetrain: Overhead valve, 2 valves per cylinder
Fuel system: Carburettor
Cooling system: Air-cooled
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)
