Siddeley Puma

Puma

Siddeley Puma
Type	Inline engine
National origin	United Kingdom
Manufacturer	Siddeley-Deasy
First run	1917
Major applications	Airco D.H.9
Developed into	ADC Nimbus

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, production continued until December 1918. At least 4,288 of the 11,500 ordered engines were delivered, 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.

The engine was based on a previous B.H.P engine which was also developed as the Galloway "Adriatic."

Applications

The Puma engine was used in the British World War I bomber aircraft, the Airco D.H.9. In use it 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.

Short Silver Streak (1920)

Specifications (Puma)

Data from Lumsden^[2]

General characteristics

Type: 6-cylinder water-cooled inline aircraft piston engine
Bore: 5.71 in (145 mm)
Stroke: 7.48 in (190 mm)
Displacement: 1,149 in³ (18.832 L)
Length: 69.9 in (1,175 mm)
Width: 24 in (610 mm)
Height: 43.6 in (1,107 mm)
Dry weight: 645 lb (293 kg)

Components

Fuel system: Carburettor
Cooling system: Water-cooled

Performance

Power output:
250 hp (186 kW) at 1,400 rpm for takeoff
265 hp (198 kW) at 1,500 rpm for short-term maximum power
Specific power: 0.23 hp/in³ (10.5 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: 0.41 hp/lb (0.67 kW/kg)

References

Notes

↑ Munson, Kenneth "Aircraft of World War I". Ian Allan 1967. ISBN 0-7110-0356-4
↑ Lumsden 2003, p. 86

Bibliography

Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links

"The Siddeley Aero Engines: The "Puma"" (PDF). Flight XI (14): 429–431. April 3, 1919. No. 536. Retrieved January 12, 2011. Contemporary technical description of the engine with photographs.
The Virtual Aviation Museum

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

Aviation in World War I

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Campaigns and battles	Strategic bombing German Cuxhaven Bombing of cities Aerial reconnaissance Fokker Scourge Flight over Vienna Bloody April Battles

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Central Powers air services	Imperial German Air Service Austro-Hungarian Imperial and Royal Aviation Troops Ottoman Aviation Squadrons Bulgarian Army Aeroplane Section

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