Armstrong Siddeley Double Mamba

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Double Mamba at the Imperial War Museum Duxford

The Armstrong Siddeley Double Mamba was a turboprop - engine , which the British manufacturer Armstrong Siddeley produced from September 1949th The machines developed around 3000–4000 ehp (2500–3000 kW). They were mainly used on the Fairey Gannet , a anti-submarine aircraft for the Fleet Air Arm of the Royal Navy .

construction and development

The Double Mamba (rarely also the Twin Mamba ) was a further development of the Mamba , the counter-rotating coaxial propellers powered by a common reduction gear.

The engine was started by cartridges, but you could also restart it in flight by the air flow. One of the two mambas could be parked during the flight to save fuel.

Variants and applications

Fairey Gannet, one half of the Double Mamba parked

The designation of the Ministry of Supply for this machine shows the obvious connection to the Mamba line:
AS = Armstrong Siddeley
M = Mamba
D = Double
No. = Model

Table 1. ASMD models and aircraft
model Thrust (ehp) Engine
components		 plane
ASMD.1 2950 2 × ASM.3 Fairey Gannet AS Mark 1
Blackburn B88 (prototype)
ASMD.3 3145 2 × ASM.5 Fairey Gannet AS Mark 4
ASMD.4 3875 2 × ASM.6 Fairey Gannet AEW Mark 3

The Double Mamba was also proposed as a propulsion system for the Westland Westminster , a 30-seat helicopter. It was later built as a prototype with two Napier Eland E220 engines.

Specimens in museums

Double Mambas are exhibited in the following museums:

Data (ASMD.3)

Sliced ​​Double Mamba at The Flambards Experience in Cornwall
Double Mamba in a non-exhibited aircraft in the Fleet Air Arm Museum (Australia)
Double Mamba - side view

General

  • Type: Turboprop
  • Length: 2597 mm
  • Diameter: 1341 mm
  • Weight: 984 kg

Components

  • Compressor: 2 ×, axial, 10-stage
  • Combustion chambers: 2 × 6
  • Turbine: 2 × 2-stage

power

  • Power: 2960 eshp (2207 kW)
  • Overall print ratio: 5.35: 1
  • Air mass flow: 2 × 8.4 kg / s
  • Power-to-weight ratio : 0.446 kg / kW

Individual evidence

  1. ^ Bill Gunston: World Encyclopedia of Aero Engines . Patrick Stephens, Cambridge 1989. ISBN 1-85260-163-9 . P. 20.
  2. ^ Aero Engines 1954 . In: Flight . www.flightglobal.com. April 9, 1954. Retrieved November 4, 2008.

literature

Web links

Commons : Armstrong Siddeley Double Mamba  - Collection of Images, Videos and Audio Files