Armstrong Siddeley Cheetah

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The Armstrong-Siddeley Cheetah is a British air-cooled aircraft radial engine.

Contents 1 Development 2 Variants 3 Specifications (Cheetah XV) 4 Applications 5 References 6 See also

[edit] Development

The basic design of the Cheetah remained unchanged since its introduction in 1919. It was the first engine of its type to be certified for 1,200 hours of operational time between overhauls. Over 35,000 engines were built.

The Cheetah was used to power many British trainer aircraft during World War II including the Avro Anson and Airspeed Oxford.

[edit] Variants

• Cheetah IX - 355 hp (265 kW) at 2,425 rpm
• Cheetah X - 375 hp (280 kW) at 2,300 rpm
• Cheetah XV - supercharger, 420 hp (315 kW) at 2,550 rpm
• Cheetah 25 - Cheetah XV uprated to 475 hp (355 kW) at 2,700 rpm

[edit] Specifications (Cheetah XV)

General characteristics

• Type: Seven-cylinder supercharged air-cooled radial engine
• Bore: 5.25 in (133 mm)
• Stroke: 5.5 in (140 mm)
• Displacement: 834 in³ (13.65 l)
• Length: 49.6 in (1,261 mm)
• Diameter: 47.7 in (1,210 mm)
• Width: 22.22 in (564 mm)
• Dry weight: 805 lb (365 kg)

Components

• Valvetrain: Two pushrod-actuated valves per cylinder with sodium-cooled exhaust valve
• Supercharger: Centrifugal
• Fuel system: Claudel-Hobson carburetor
• Fuel type: 87 octane
• Cooling system: Air-cooled.

Performance

• Power output:
  
  • 420 hp (315 kW) at 2,550 rpm for takeoff at sea level
  • 400 hp (300 kW) at 2,425 rpm for cruise at 4,000 ft (1,220 m)
• Specific power: 0.50 hp/in³ (23.1 kW/l)
• Compression ratio: 6.35:1
• Fuel consumption: 16 Imp gal (3.5 l) /hour at economical cruise
• Power-to-weight ratio: 0.52 lb/hp (0.86 kW/kg)

[edit] Applications

• Airspeed Courier
• Airspeed Envoy
• Airspeed Oxford
• Airspeed Queen Wasp
• Avro 626
• Avro Anson

[edit] References

• Bridgman, L, (ed.) (1998) Jane's fighting aircraft of World War II. Crescent. ISBN 978-0-517-67964-7

[edit] See also

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