“Armstrong Siddeley Double Mamba”的意思、由来-开放百科全书

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Armstrong Siddeley Double Mamba

释义

Design and development
Variants
Applications
Engines on display
Specifications (ASMD.3)
See also
References
Notes Bibliography
External links

name=Double Mamba

image= File:ASDoubleMamba.JPG

caption=Preserved Double Mamba at the Imperial War Museum Duxford

}}{{Infobox Aircraft Engine

type=Turboprop

manufacturer=Armstrong Siddeley

1949}} (First flight)

major applications=Fairey Gannet

number built =

program cost =

unit cost =

developed from = Armstrong Siddeley Mamba

developed into =

variants with their own articles =
}}

The Armstrong Siddeley Double Mamba, Ministry of Supply (MoS) designation ASMD.n, is 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 anti-submarine aircraft developed for the Fleet Air Arm of the Royal Navy.

Design and development

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.^[1]

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

ASMD.1: {{cvt|2,950|shp}} (2 x ASMa.3) used on Fairey Gannet A.S. Mk.1 and Blackburn B-88

ASMD.3: {{cvt|3145|shp}} (2 x ASMa.5) used on Fairey Gannet A.S. Mk.4

ASMD.4: {{cvt|3875|hp}} (2 x ASMa.6) used on Fairey Gannet AEW Mk.3

ASMD.8: {{cvt|3875|hp}} (2 x ASMa.6) used on Fairey Gannet AEW Mk.3

Applications

Blackburn B-88
Fairey Gannet

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:

Australian National Aviation Museum
Deutsches Museum Flugwerft Schleissheim
Gatwick Aviation Museum
Imperial War Museum Duxford
Midland Air Museum
Queensland Air Museum

Specifications (ASMD.3)

{{jetspecs
|
|ref=Flight^[2]
|type=Turboprop engine
|length=102.25 in (2,597 mm)
|diameter=52.8 in (1,341 mm)
|weight=2,170 lb (984 kg)
|compressor=10 stage axial (x2)
|combustion=Six combustion chambers (x2)
|turbine=
|fueltype=
|oilsystem=
|power=2,960 eshp (2,207 kW)
|thrust=
|compression=5.35:1
|aircon=18.5 lb/sec (8.4 kg/s) per single Mamba unit
|turbinetemp=
|fuelcon=
|specfuelcon=1.71 lb/(lbf·h)
|power/weight=1.36 eshp/lb
|thrust/weight=
}}

References

Notes

1. ^Gunston 1989, p.20.
2. ^[https://www.flightglobal.com/pdfarchive/view/1954/1954%20-%200979.html Aero Engines 1954] Flight International magazine, Flight Global/Archives, 9 April 1954, on www.flightglobal.com. Retrieved: 29 October 2016

Bibliography

Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}

External links

Original Armstrong Siddeley Double Mamba advertisement - Flight, 29 June 1950

2 : Turboprop engines 1940–1949|Armstrong Siddeley aircraft engines

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