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Armstrong Siddeley Mongoose

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Mongoose
Armstrong Siddeley Mongoose fitted to the Shuttleworth Collection's airworthy Hawker Tomtit
Type Radial engine
National origin United Kingdom
Manufacturer Armstrong Siddeley
First run Template:Avyear
Major applications Hawker Tomtit
Avro 504N
Developed into Armstrong Siddeley Serval

The Armstrong Siddeley Mongoose is a British five-cylinder radial aero engine produced by Armstrong Siddeley. Developed in the mid-1920s it was used in the Hawker Tomtit trainer and Parnall Peto seaplane amongst others. With a displacement of 540 cubic inches (9 litres) the Mongoose had a maximum power output of 155 horsepower (115 kilowatts).

A Mongoose engine powers the sole remaining airworthy Hawker Tomtit, based at Old Warden.

Design and development

The Mongoose is a five-cylinder, single-row, air-cooled radial piston engine. The engine features twin forward-mounted ignition magnetos and enclosed valve rockers, the cylinders being the same as those used for the earlier Jaguar engine.[1] An unusual feature of the Mongoose is the vertical position of the lower cylinder, a design thought likely to promote oil fouling of the spark plugs.[2]

Built in several variants, power output ranged between 135 and 155 hp (100-115 kW).

Variants

Mongoose I
1926, 135 hp.
Mongoose II
1930, 155 hp.
Mongoose III
1929.
Mongoose IIIA
1929, civil use.
Mongoose IIIC
1929, Military use based on IIIA.

Applications

Mongoose-powered Hawker Tomtit

Note:[3]

Survivors

An Armstrong Siddeley Mongoose IIIC powers the sole remaining airworthy Hawker Tomtit, K1786/G-AFTA, owned and operated by the Shuttleworth Collection this aircraft flies regularly throughout the summer months.[4]

Specifications (Mongoose I)

Data from Lumsden.[2][5]

General characteristics

  • Type: 5-cylinder single-row radial
  • Bore: 5 in (127 mm)
  • Stroke: 5.5 in (139.7 mm)
  • Displacement: 540 cu in (8.8 L)
  • Length: 36.6 in (93 cm)
  • Diameter: 45.6 in (116 cm)
  • Dry weight: 340 lb (154 kg)

Components

Performance

See also

Related development

Comparable engines

Related lists

References

Notes

  1. ^ Gunston 1989, p. 18.
  2. ^ a b Lumsden 2003, p. 69.
  3. ^ List from Lumsden
  4. ^ The Shuttleworth Collection - Hawker Tomtit Retrieved: 22 February 2012
  5. ^ Lumsden 2003, Part 4.

Bibliography

  • Gunston, Bill. World Encyclopaedia 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.
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