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Armstrong Siddeley Ounce 
Summary
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.
| Ounce | |
|---|---|
| |
| Type | Piston engine |
| National origin | United Kingdom |
| Manufacturer | Armstrong Siddeley |
| First run | 1920 |
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)
See also edit
Comparable engines
Related lists
References edit
Notes edit
Bibliography edit
External links edit
Wikimedia Commons has media related to Armstrong Siddeley Ounce.
- AS Ounce information and images at the Power House Museum, Sydney, Australia