Armstrong Siddeley Tiger

For the 1920 V12 engine, see Siddeley Tiger.

The Armstrong Siddeley Tiger was a British 14-cylinder air-cooled aircraft radial engine developed by Armstrong Siddeley in the 1930s from their Jaguar engine. The engine was built in a number of different versions but performance and dimensions stayed relatively unchanged. The Tiger VIII was the first British aircraft engine to use a two-speed supercharger.

Tiger
Armstrong Siddeley Tiger at the Science Museum (London)
Type	Radial engine
Manufacturer	Armstrong Siddeley
First run	1932
Major applications	Armstrong Whitworth Ensign Blackburn Shark

Applications

• Armstrong Whitworth A.W.19
• Armstrong Whitworth AW.23
• Armstrong Whitworth A.W.29
• Armstrong Whitworth Ensign
• Armstrong Whitworth Whitley
• Blackburn B-6
• Blackburn B-7
• Blackburn Shark
• Blackburn Ripon
• Fairey G4/31
• Handley Page H.P.51
• Short Calcutta

Engines on display

A preserved Armstrong Siddeley Tiger is on display at the Science Museum (London).

Specifications (Tiger VIII)

Data from Lumsden.

General characteristics

• Type: 14-cylinder supercharged two-row air-cooled radial engine
• Bore: 5.5 in (139.7 mm)
• Stroke: 6.0 in (152.4 mm)
• Displacement: 1,995 in³ (32.7 L)
• Length: 64.6 in (1,641 mm)
• Diameter: 50.8 in (1,290 mm)
• Dry weight: 1,287 lb (584 kg)

Components

• Valvetrain: Two pushrod-actuated valves per cylinder
• Supercharger: Two-speed centrifugal type supercharger, first gear ratio 5.34:1, second gear 7.96:1.
• Fuel system: Claudel-Hobson carburettor
• Fuel type: 87 octane rating petrol
• Cooling system: Air-cooled
• Reduction gear: Spur, 0.594:1

Performance

• Power output:
  
• 907 hp (677 kW) at 2,375 rpm for takeoff
• 850 hp (634 kW) at 2,450 rpm at 7,150 ft (2,180 m) – first supercharger gear
• 771 hp (575 kW) at 2,450 rpm at 16,240 ft (4,950 m) – second supercharger gear
• 582 hp (434 kW) at 2,200 rpm economy cruise
• Specific power: 0.45 hp/in³ (20.7 kW/L)
• Compression ratio: 6.25:1
• Specific fuel consumption: 0.49 lb/(hp•h) (294 g/(kW•h))
• Oil consumption: 0.21–0.42 oz/(hp•h) (8–16 g/(kW•h))
• Power-to-weight ratio: 0.70 hp/lb (1.16 kW/kg)

See also

Related development

• Armstrong Siddeley Jaguar
• Armstrong Siddeley Panther

Related lists

• List of aircraft engines

References

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
• Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

External links

• Oldengine.org