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Armstrong Siddeley Leopard

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The Armstrong Siddeley Leopard was a British 14-cylinder twin-row air-cooled radial aero engine developed in 1927 by Armstrong Siddeley. It was the most powerful radial engine in the world when introduced.

Contents

Variants

Leopard I
700 hp, medium supercharged. Direct drive propeller.
Leopard II
700 hp, geared epicyclic drive.
Leopard III
800 hp, two-valve cylinder head, direct drive.
Leopard IIIA
800 hp, geared epicyclic drive.

Applications

  • Blackburn Iris
  • Junkers Ju 52
  • Hawker Dantorp
  • Hawker Horsley

    • Specifications (Leopard I)

    Data from

    General characteristics

  • Type: 14-cylinder twin-row air-cooled radial engine
  • Bore: 6.0 in (152.4 mm)
  • Stroke: 7.5 in (190.5 mm)
  • Displacement: 2,970 cu in (48.6 L)
  • Length: 60.85 in (1546 mm)
  • Diameter: 58 in (1473 mm)
  • Dry weight: 1,466 lb (665 kg)

    • Components

  • Valvetrain: Overhead valve, four valves per cylinder
  • Fuel type: Petrol
  • Cooling system: Air-cooled

    • Performance

  • Power output: 700 hp (522 kW) at 1,650 rpm at sea level
  • Compression ratio: 5.00:1
  • Fuel consumption: 45 gal/hr (169 l/hr) at cruise speed
  • Power-to-weight ratio: 0.47 hp/lb

    • References

    Armstrong Siddeley Leopard Wikipedia
    (Text) CC BY-SA


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