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. 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.

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^[2]

Piaggio P.II

Licence production in Italy by Piaggio.

Applications

Airspeed Courier Airspeed Envoy Albatros L 68 Avro 504 Avro 618 Ten Avro Avocet Avro 641 Commodore Avro 626 Avro 642/4m Eighteen Avro Sea Tutor Avro Tutor BAT Bantam Blackburn Lincock Boulton Paul Bittern Canadian Vickers Vanessa Canadian Vickers Varuna Canadian Vickers Vedette Cierva C.8 de Havilland Hawk Moth

Preserved Lynx fitted to an Avro 504N Fairchild FC-2 Fokker C.VII Fokker F.VIIA Gloster Grouse Messerschmitt M 18 Morane-Saulnier MS.230 Nieuport-Delage NiD 39 Larynx Parnall Parasol Raab-Katzenstein RK-26 Wackett Warrigal Saro Cloud Saro Cutty Sark Supermarine Seamew Vickers Vireo VL Tuisku Westland Wagtail

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.^[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)

See also

Related development

• Armstrong Siddeley Cheetah
• Armstrong Siddeley Jaguar

Comparable engines

• Jacobs R-755
• Siemens-Halske Sh 14
• Walter Castor
• Warner Scarab
• Wright R-760

Related lists

• List of aircraft engines

References

Notes

1. "Alfa Aero Engines". aroca-qld.com. Retrieved 2007-08-25.
2. Lumsden 2003, p.74.
3. The Shuttleworth Collection - Avro Tutor Retrieved: 11 February 2009
4. Lumsden 2003, p.66-67.

Bibliography

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