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Armstrong Siddeley Double Mamba
Wright Aeronautical J-65

 

as-dbl-mam



The Armstrong Siddeley Double Mamba was a turboprop engine design developed in the late 1940s of around 3,000–4,000 hp (2,500–3,000 kW). It was used mostly on the Fairey Gannet (First flight 29 September 1949) anti-submarine aircraft developed for the Fleet Air Arm of the Royal Navy.

The Double Mamba (rarely known as the Twin Mamba) was a development of the Armstrong Siddeley Mamba with two Mambas driving contra-rotating propellers through a combining gearbox.
Engine starting was by cartridge, however, forced air restart was achieved in flight. One engine could be shut down in flight to conserve fuel.

Ministry of Supply designation system:
AS = Armstrong Siddeley
M = Mamba
D = Double
num = model

Variants and applications:

ASMD.1
Type: Turboprop engine
Component engines: 2 x ASM.3
Maximum power output: 2950 eshp
Aircraft fitted:
Fairy Gannet A.S. Mk.1
Blackburn B88 (prototype)

ASMD.3
Type: Turboprop engine
Component engines: 2 x ASM.5
Compressor: 10 stage axial (x2)
Combustors: Six combustion chambers (x2)
Length: 102.25 in (2,597 mm)
Diameter: 52.8 in (1,341 mm)
Dry weight: 2,170 lb (984 kg)
Maximum power output: 2,960 eshp (2,207 kW)
Overall pressure ratio: 5.35:1
Power-to-weight ratio: 1.36 eshp/lb
Aircraft fitted: Fairy Gannet A.S. Mk.4

ASMD.4
Type: Turboprop engine
Component engines: 2 x ASM.6
Maximum power output: 3875 eshp
Aircraft fitted: Fairy Gannet AEW Mk.3

 

 


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