Armstrong Siddeley Mongoose
{{short description|1920s British piston aircraft engine}}
{{Use dmy dates|date=August 2017}}
{{Use British English|date=August 2017}}
| {{Infobox Aircraft Begin
|name = Mongoose |image = Armstrong Siddeley Mongoose.jpg |caption = Armstrong Siddeley Mongoose fitted to the Shuttleworth Collection's airworthy Hawker Tomtit }}{{Infobox Aircraft Engine |type=Radial engine |manufacturer=Armstrong Siddeley |national origin=United Kingdom |first run=1926 |major applications=Hawker Tomtit |number built = |program cost = |unit cost = |developed from = |developed into = Armstrong Siddeley Serval |variants with their own articles = }} |
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.Gunston 1989, p. 18. 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.Lumsden 2003, p. 69.
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
Surviving engines
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.[http://www.shuttleworth.org/shuttleworth-collection/aircraft-details.asp?ID=20 The Shuttleworth Collection - Hawker Tomtit] {{Webarchive|url=https://web.archive.org/web/20131210203620/http://www.shuttleworth.org/shuttleworth-collection/aircraft-details.asp?ID=20 |date=10 December 2013 }} Retrieved: 22 February 2012
Specifications (Mongoose I)
{{pistonspecs|
|ref=Lumsden.Lumsden 2003, Part 4.
|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)
|width=
|height=
|weight=340 lb (154 kg)
|valvetrain=Overhead poppet valves
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=77 Octane petrol
|oilsystem=
|coolingsystem=Air-cooled
|power=138 hp (103 kW) at 1,750 rpm at sea level
|specpower=
|compression=5:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=0.4 hp/lb (0.67 kW/kg)
|designer=
|reduction_gear=Direct drive, left-hand tractor
|general_other=
|components_other=
|performance_other=
}}
See also
{{aircontent
|see also=
|related=
|similar aircraft=
|lists=
|similar engines=
}}
References
=Notes=
{{reflist}}
=Bibliography=
{{refbegin}}
- 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}}.
{{refend}}
External links
{{Commons category|Armstrong Siddeley Mongoose}}
- [http://www.flightglobal.com/pdfarchive/view/1929/1929-1%20-%200382.html Armstrong Siddeley Mongoose - Flight, July 1929]
{{Armstrong Siddeley aeroengines}}