Armstrong Siddeley Cougar

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.

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

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 petrol
• Oil system: Pressure fed at 80 psi (5.5 bar), dry sump.
• 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 (2,290 m)
• (Normal) 690 hp (515 kW) at 2,500 rpm at 6,000 ft (1,830 m)
• (Cruising) 500 hp (373 kW) at 2,300 pm 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 h) (0.011 kg/(kW h))
• Oil consumption: 0.012 lb/(hp h) (0.005 kg/(kW h))
• Power-to-weight ratio: 0.83 hp/lb (1.37 kW/kg)

See also

Related lists

• List of aircraft engines

References

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

Further reading

• Bridgman, Leonard, ed. (1947). Jane's all the World's Aircraft 1947. London: Sampson Low, Marston & Co. pp. 14d–15d.