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(Top) 1 Applications 2 Specifications (Ounce) 2.1 General characteristics 2.2 Components 2.3 Performance 3 See also 4 References 4.1 Notes 4.2 Bibliography 5 External links

Armstrong Siddeley Ounce

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Ounce

Type	Piston engine
National origin	United Kingdom
Manufacturer	Armstrong Siddeley
First run	1920

The Armstrong Siddeley Ounce was a small two-cylinder aero engine developed by Armstrong Siddeley in 1920.^[1] The engine was originally conceived as a test piece but ran very well and was put into production for early ultralight aircraft and use in target drones. The Ounce used two cylinders from the preceding Jaguar I radial engine.

Applications[edit]

Specifications (Ounce)[edit]

Data from Lumsden.^[2]

General characteristics

Type: Two cylinder, horizontally-opposed air cooled piston engine
Bore: 5.0 in (127 mm)
Stroke: 5.0 in (127 mm)
Displacement: 196 cu in (3.2 L)
Length: 20.5 in (521 mm)
Width: 39.5 in (1003 mm)
Height: 24.5 in (622 mm)
Dry weight: 170 lb (77 kg)

Components

Valvetrain: Overhead valve
Fuel system: Carburettor
Cooling system: Air cooled

Performance

Power output: 45 hp (33.5 kW) at 1,500 rpm
Compression ratio: 5:1
Power-to-weight ratio: 0.26 hp/lb (0.43 kW/kg)

References[edit]

Notes[edit]

^ Gunston 1989, p.18.

^ Lumsden 2003, p.66.

Bibliography[edit]

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[edit]

Wikimedia Commons has media related to Armstrong Siddeley Ounce.

AS Ounce information and images at the Power House Museum, Sydney, Australia

v t e 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

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