Sunbeam Dyak

The Sunbeam Dyak was a British inline six-cylinder, water-cooled, twin updraft carburettor engine.

Dyak
Sunbeam Dyak in an Avro 504K
Type Piston inline aero-engine
Manufacturer Sunbeam
First run May 1918
Major applications Avro 504
Variants Sunbeam Pathan

It had an aluminium sump, block and cylinder head, and is an overhead camshaft design with two valves per cylinder. The output was approximately 106 horsepower (79 kW). The engine was started by turning a geared crank handle in the cockpit. The diesel-powered Sunbeam Pathan was developed from this engine.

The first Queensland and Northern Territory Aerial Services (QANTAS) aircraft in Australia (an Avro 504K) was fitted with a Sunbeam Dyak engine by the Australian Aircraft & Engineering Co. Ltd. in Mascot, New South Wales.[1]

Avro Dyak used by QANTAS (c. 1921)

Specifications (Dyak)

Data from Lumsden[2]

General characteristics

Components

  • Valvetrain: Overhead camshaft, two valves per cylinder
  • Cooling system: Liquid-cooled
  • Reduction gear: Direct drive, left-hand tractor

Performance

See also

Comparable engines

Related lists

References

Notes

  1. Swopes, Bryan. "Sunbeam Dyak Archives". This Day in Aviation. Retrieved 17 December 2022.
  2. Lumsden 2003, p. 228.

Bibliography

  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
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