Armstrong Siddeley Lynx

Lynx
	Armstrong Siddeley Lynx fitted to the Shuttleworth Collection's airworthy Avro Tutor
Type	Radial aero engine
National origin	United Kingdom
Manufacturer	Armstrong Siddeley
First run	1920
Number built	6,000
Developed from	Armstrong Siddeley Jaguar
Developed into	Armstrong Siddeley Cheetah

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.^[1]

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. Effectively half a Panther^[2]
Piaggio P.II: Licence production in Italy by Piaggio.

Applications

Survivors

Another view of the Armstrong Siddeley Lynx fitted to the Shuttleworth Collection's airworthy Avro Tutor
Avro Tutor, K3215, powered by a Lynx IV, flies regularly at the Shuttleworth Collection and can be viewed in the museum at other times.^[3]

Specifications (Lynx IV)

Armstrong Siddeley Lynx 7-cylinder radial from the Avro 618 Ten aircraft, Southern Cloud

Data from Lumsden^[4]

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)

References

Notes

^ "Alfa Aero Engines". aroca-qld.com. Archived from the original on 8 October 2007. Retrieved 25 August 2007.
^ Lumsden 2003, p.74.
^ The Shuttleworth Collection - Avro Tutor Archived 12 February 2010 at the Wayback Machine Retrieved: 11 February 2009
^ Lumsden 2003, p.66-67.

Bibliography

Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

[aroca-qld.com-1] "Alfa Aero Engines". aroca-qld.com. Archived from the original on 8 October 2007. Retrieved 25 August 2007.

[2] Lumsden 2003, p.74.

[3] The Shuttleworth Collection - Avro Tutor Archived 12 February 2010 at the Wayback Machine Retrieved: 11 February 2009

[4] Lumsden 2003, p.66-67.

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