Siddeley Puma

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The Siddeley Puma was a British aero engine developed towards the end of World War I and produced by Siddeley-Deasy. The first engines left the production lines of Siddeley-Deasy in Coventry in August 1917 and the production continued until December 1918. At least 4,288 of the 11,500 ordered engines were delivered, then the orders were cancelled following the Armistice. Production was continued under the name Armstrong Siddeley Puma when the manufacturer was bought by Armstrong Whitworth and became Armstrong Siddeley.

Contents 1 Specific Uses 2 Specifications 3 References 4 See also

[edit] Specific Uses

• The Puma engine was used in the British World War I bomber aircraft, the Airco D.H.9. At the time, the unit was unproven and in use proved to be highly troublesome making the aircraft significantly inferior to the type it replaced. The engine was also installed untidily, with the cylinder heads protruding. The D.H.9, as a type, was improved by replacing the Puma engine with the Liberty 12 to make the D.H.9A.^[1]

• The unit was used in the first prototype of the Airco DH.10 in a twin-engined pusher configuration but as performance was unsatisfactory, alternative engines were used in a subsequent prototype of the type and production models.

[edit] Specifications

General characteristics

• Type: 6-cylinder water-cooled inline aircraft piston engine
• Bore: 5.7 in (145 mm)
• Stroke: 7.5 in (190 mm)
• Displacement: 1,147 in³ (18.8 L)
• Dry weight: 530 lb (240 kg)

Components

• Fuel system: Carburettor
• Cooling system: Water-cooled

Performance

• Power output:
  
  • 187 hp (140 kW) at 1,300 rpm for cruise
  • 243 hp (181 kW) at 1,450 rpm for short-term maximum power
• Specific power: 0.21 hp/in³ (9.6 kW/L)
• Fuel consumption:
  
  • 14 US gal/h (54 L/h) at cruise
  • 67 US gal/h (258 L/h) at short-term maximum power
• Power-to-weight ratio: 0.46 hp/lb (0.75 kW/kg)

[edit] References

• The Virtual Aviation Museum

1. ^ Munson, Kenneth "Aircraft of World War I". Ian Allan 1967. ISBN 0-7110-0356-4

[edit] See also

• List of aircraft engines

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