Armstrong Siddeley Cougar

Cougar

Type	Radial engine
National origin	United Kingdom
Manufacturer	Armstrong Siddeley
First run	1945

The Armstrong Siddeley Cougar was an aero engine developed by Armstrong Siddeley in 1945. The design was a departure from earlier Armstrong Siddeley engines in many ways, it was the company's only nine-cylinder radial design. Although the engine was tested it did not find an aircraft application and was not produced.

Specifications (Cougar)

Data from Flightglobal Archive.^[1]^[2]

General characteristics

Type: 9-cylinder single-row air-cooled radial engine
Bore: 5.5 in (140 mm)
Stroke: 5.5 in (140 mm)
Displacement: 1,176 cu in (19 l)
Length: 51.5 in (1,308 mm)
Diameter: 49.5 in (1,257 mm)
Dry weight: 1,020 lb (463 kg)

Components

Valvetrain: Overhead valve operated by pushrods
Supercharger: 1 stage gear driven 8.17:1 supercharger
Fuel system: R.A.E.-Hobson AS/C2 fuel injection to supercharger with automatic boost control
Fuel type: 100/130 aviation gasoline (D.E.D. 2475)
Oil system: pressure fed at 80 psi (551,580.58 Pa), dry sump, 100 S.U. (20.5 cs) grade oil (D.

E.D. 2472B)

Cooling system: Air-cooled

Performance

Power output:
(Take-off) 850 hp (634 kW) at 2,800 rpm at 46.0 inHg / +8.0Lb boost for 15 minutes
(Maximum) 730 hp (544 kW) at 2,700 rpm at 7,500 ft (2,286 m)
(Normal) 690 hp (515 kW) at 2,500 rpm at 6,000 ft (1,829 m)
(Cruising) 500 hp (373 kW) at 2,300 rpm at 10,500 ft (3,200 m)
Specific power: 0.76 hp/cu in (34.6 kW/l)
Compression ratio: 6.3:1
Specific fuel consumption: 0.46 lb/hp/hr (0.011 kg/kW/hr)
Oil consumption: 0.012 lb/hp/hr (0.005 kg/kW/hr)
Power-to-weight ratio: 0.83 hp/lb (1.362 kW/kg)

References

Notes

↑ Flightglobal archive - January 1946 Retrieved: 19 December 2008
↑ Wilkinson, Paul H. (1946). Aircraft Engines of the World. London: Sir isaac Pitman & Sons Ltd.

Bibliography

Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
Wilkinson, Paul H. (1946). Aircraft Engines of the World. London: Sir isaac Pitman & Sons Ltd.
Bridgman, Leonard, ed. (1947). Jane's all the World's Aircraft 1947. London: Sampson Low, Marston & Co. pp. 14d–15d.

Armstrong Siddeley aero engines

Piston engines	Boarhound Cheetah Civet Cougar Deerhound Genet Genet Major Hyena Jaguar Jaguar Major Leopard Lynx Lynx Major Mongoose Ounce Panther Puma Serval Tiger (V12) Tiger (Radial) Wolfhound

Turbojets	Adder ASX Sapphire Viper

Turboprops	ASP Double Mamba Mamba Python

Rocket engines	Beta Snarler Screamer Stentor Gamma

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