The Armstrong Siddeley Double Mamba is a turboprop engine design developed in the late 1940s of around 3,000–4,000hp (2,200–3,000kW). It was used mostly on the Fairey Gannet anti-submarine aircraft developed for the Fleet Air Arm of the Royal Navy.
Engine starting was by cartridge, however, forced air restart was achieved in flight. One engine could be shut down in flight to conserve fuel. Shutting down one engine also stopped one of the propellers.
Variants
Fairey Gannet flying with one half of its Double Mamba engine shut down
ASMD.1
2,950shp (2,200kW) (2 x ASMa.3) used on Fairey Gannet A.S. Mk.1 and Blackburn B-88
ASMD.3
3,145shp (2,345kW) (2 x ASMa.5) used on Fairey Gannet A.S. Mk.4
ASMD.4
3,875hp (2,890kW) (2 x ASMa.6) used on Fairey Gannet AEW Mk.3
ASMD.8
3,875hp (2,890kW) (2 x ASMa.6) used on Fairey Gannet AEW Mk.3
The Double Mamba engine was also proposed for the Westland Westminster, a 30-seat helicopter that was later built as a prototype powered by a pair of Napier Eland E220 turboshaft engines.
Engines on display
Preserved Double Mamba engines are on public display at the:
Cut away of a double mamba power unit at The Flambards Experience in CornwallDouble Mamba in a non-display aircraft at the Fleet Air Arm Museum (Australia).Double Mamba - side view in-situ.
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