• Source: Armstrong Siddeley Mongoose

    • 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. 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.
    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



    Note:

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


    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.


    Specifications (Mongoose I)


    Data from Lumsden.


    = 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



    Related development

    Armstrong Siddeley Serval

    Comparable engines

    Kinner R-5
    Shvetsov M-11
    Wright R-540
    Related lists

    List of aircraft engines


    References




    = Notes

    =


    = Bibliography

    =


    External links



    Armstrong Siddeley Mongoose - Flight, July 1929

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