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Armstrong Siddeley Ounce

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Armstrong Siddeley Ounce

The Armstrong Siddeley Ounce was a small two-cylinder aero engine developed by Armstrong Siddeley in 1920. 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.

Contents

Applications

  • Bristol Babe
  • R.A.E. Aerial Target

    • Specifications (Ounce)

    Data from Lumsden.

    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

    Armstrong Siddeley Ounce Wikipedia
    (Text) CC BY-SA


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