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The Armstrong Siddeley Mamba was a British turboprop engine produced by Armstrong Siddeley in the late 1940s and 1950s, producing around 1,500 effective horsepower (1,100 kW).
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 ASMa (Armstrong Siddeley Mamba). The ASMa.3 gave 1,475 ehp and the ASMa.6 was rated at 1,770 ehp. A 500-hour test was undertaken in 1948
Variants and applications
thumb|right|The Armstrong Siddeley Mamba-powered Douglas C-47B Dakota testbed in 1954 showing the slim outline of the Mambas
;ASMa.3 Mamba:
:Armstrong Whitworth Apollo
:Avro Athena
:Boulton Paul Balliol
:Breguet Br 971 (turboprop proposal)
:Breguet Vultur
:Miles M.69 Marathon II
:Douglas C-47 Dakota
:Short SB.3
;ASMa.5 Mamba:Development engine for Armstrong Siddeley ASMD.3 Double Mamba
Overseas, a Swiss-Mamba SM-1 is displayed at the Flieger-Flab-Museum Dübendorf in Switzerland and another Mamba can be seen at the Aviation Heritage Museum (Western Australia).
Specifications (ASMa.6)
thumb|right|Mamba and propeller from the Apollo airliner