Armstrong Siddeley Mongoose

1920s British piston aircraft engine

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[edit]

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[edit]

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[edit]

Mongoose-powered Hawker Tomtit

Note:[3]

* ANBO III (Second batch, 1931)[4]
* Avro 504N
* Avro 504R
* Avro Tutor
* Avro Type 621 Trainer
* Handley Page Hamlet
* Handley Page Gugnunc
* Hawker Tomtit
* Parnall Peto
* Fokker S.IV

## Survivors[edit]

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.[5]

## Specifications (Mongoose I)[edit]

Data from Lumsden.[2][6]

### 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)

## See also[edit]

Related development

* Armstrong Siddeley Serval

Comparable engines

* Kinner R-5
* Shvetsov M-11
* Wright R-540

Related lists

* List of aircraft engines

## References[edit]

### Notes[edit]

1. ^ Gunston 1989, p. 18.
2. ^ a b Lumsden 2003, p. 69.
3. ^ List from Lumsden
4. ^ Ramoška, Gytis, ANBO III. Pirmasis serijinis lietuviškas lėktuvas, Plieno Sparnai, (in Lithuanian) Nr. 7 2002 m.
5. ^ The Shuttleworth Collection - Hawker Tomtit Archived 10 December 2013 at the Wayback Machine Retrieved: 22 February 2012
6. ^ Lumsden 2003, Part 4.

### Bibliography[edit]

* 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[edit]

Wikimedia Commons has media related to Armstrong Siddeley Mongoose.

* Armstrong Siddeley Mongoose - Flight, July 1929

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