Armstrong Siddeley Mongoose

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	1926
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

Valvetrain: Overhead poppet valves
Fuel type: 77 Octane petrol
Cooling system: Air-cooled
Reduction gear: Direct drive, left-hand tractor

Performance

Power output: 138 hp (103 kW) at 1,750 rpm at sea level
Compression ratio: 5:1
Power-to-weight ratio: 0.4 hp/lb (0.67 kW/kg)

References

Notes

↑ Gunston 1989, p. 18.
1 2 Lumsden 2003, p. 69.
↑ List from Lumsden
↑ The Shuttleworth Collection - Hawker Tomtit Retrieved: 22 February 2012
↑ 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.

External links

Wikimedia Commons has media related to Armstrong Siddeley Mongoose.

Armstrong Siddeley Mongoose - Flight, July 1929

Armstrong Siddeley aero engines

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Turbojets	Adder ASX Sapphire Viper

Turboprops	ASP Double Mamba Mamba Python

Rocket engines	Beta Snarler Screamer Stentor Gamma

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