Rahul Sharma (Editor)

Armstrong Siddeley Cougar

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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.

Contents

Specifications (Cougar)

Data from Flightglobal Archive.

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. secs (20.5 cSt) 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 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 (1.362 kW/kg)

    • References

    Armstrong Siddeley Cougar Wikipedia
    (Text) CC BY-SA