Armstrong Siddeley Mamba
|ASM.3 engine at the Armstrong and Aircraft Museum at Bamburgh Castle.|
|National origin||United Kingdom|
|First run||April 1946|
|Major applications||Boulton Paul Balliol
|Developed into||Armstrong Siddeley Double Mamba
Armstrong Siddeley Adder
Armstrong Siddeley gas turbine engines were named after snakes.
Design and development
The Mamba was a compact engine  with a 10-stage axial compressor, six combustion chambers and a two-stage power turbine. The epicyclic reduction gearbox was incorporated in the propeller spinner. Engine starting was by cartridge. The Ministry of Supply designation was ASM (Armstrong Siddeley Mamba). The ASM.3 gave 1,475 ehp and the ASM.6 was rated at 1,770 ehp. A 500-hour test was undertaken in 1948 and the Mamba was the first turboprop engine to power the Douglas DC-3, when in 1949, a Dakota testbed was converted to take two Mambas.
The Mamba was also developed into the form of the Double Mamba, which was used to power the Fairey Gannet anti-submarine aircraft for the Royal Navy. This was essentially two Mambas lying side-by-side and driving contra-rotating propellers separately through a common gearbox.
Variants and applications
- ASM.3 Mamba
- Armstrong Whitworth Apollo
- Avro Athena
- Boulton Paul Balliol
- Breguet Vultur
- Miles M.69 Marathon II
- Douglas C-47 Dakota
- ASM.6 Mamba
- Short Seamew
- A version for civil applications
- Swiss-Mamba SM-1 (aft turbofan variant)
- EFW N-20
Engines on display
Data from Flight
- Type: Turboprop
- Length: 87.3 in (2217.4 mm)
- Diameter: 29 in (737 mm)
- Dry weight: 780 lb (354 kg)
- Maximum power output: 1,320 shp plus 405 lbf (1.80 kN) thrust (1,475 eshp)
- Overall pressure ratio: 5.35:1
- Air mass flow: 18.5 lb/s (8.4 kg/s)
- Specific fuel consumption: 0.8 lb/h/eshp
- Power-to-weight ratio: 1.9 eshp/lb
- Related development
- Related lists
- "Aero Engine Information". RAF Museum. Retrieved 2008-06-06.
- Gunston 1989, p.20.
- Taylor, John W.R. FRHistS. ARAeS (1955). Jane's All the World's Aircraft 1955-56. London: Sampson, Low, Marston & Co Ltd.
- "Aero Engines 1954", Flight, www.flightglobal.com, p. 446, 9 April 1954, retrieved 4 November 2008
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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