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Armstrong Siddeley Mamba

August 28, 2023

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).

Mamba
Mamba engine on display at Sheffield Hallam University
Type Turboprop
National origin United Kingdom
Manufacturer Armstrong Siddeley
First run April 1946
Major applications Boulton Paul Balliol
A.W. Apollo
Short Seamew
Developed into Armstrong Siddeley Double Mamba
Armstrong Siddeley Adder

Armstrong Siddeley gas turbine engines were named after snakes.

Design and development Edit

The Mamba was a compact engine [1] 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[1] and the Mamba was the first turboprop engine to power the Douglas DC-3, when in 1949, a Dakota testbed was converted to take two Mambas.

The Mamba was also developed into the form of the Double Mamba, which was used to power the Fairey Gannet anti-submarine aircraft for the Royal Navy. This was essentially two Mambas lying side-by-side and driving contra-rotating propellers separately through a common gearbox.

A turbojet version of the Mamba was developed as the Armstrong Siddeley Adder, by removing the reduction gearbox.[2]

Variants and applications Edit

 
The Armstrong Siddeley Mamba-powered Douglas C-47B Dakota testbed in 1954 showing the slim outline of the Mambas
ASMa.3 Mamba
[3]
Armstrong Whitworth Apollo
Avro Athena
Boulton Paul Balliol
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[3]
ASMa.6 Mamba
[3]
Short Seamew
ASMa.7 Mamba
A version for civil applications[3]
Swiss-Mamba SM-1 (aft turbofan variant)
EFW N-20
Mamba 112
(ASMa.6)

Engines on display Edit

An Armstrong Siddeley Mamba is on static display at the Midland Air Museum, Coventry Airport, Warwickshire, at the Royal Air Force Museum Cosford and at the East Midlands Aeropark.

A Mamba is also on display at the Aviation Heritage Museum (Western Australia).[4]

A Swiss-Mamba SM-1 is on display at the Flieger-Flab-Museum Dübendorf.

A Mamba is also on display at the Hertha Ayrton STEM Centre, Sheffield Hallam University, UK.

Specifications (ASMa.6) Edit

 
Mamba and propeller from the Apollo airliner

Data from Aircraft engines of the World 1957[5]

General characteristics

  • Type: Turboprop
  • Length: 90.2 in (2,290 mm)
  • Diameter: 33 in (840 mm)
  • Frontal area: 5.9 sq ft (0.55 m2)
  • Dry weight: 850 lb (390 kg)

Components

  • Compressor: 11 stage axial flow
  • Combustors: Annular combustion chamber with 24 vapourising burners
  • Turbine: 3 stage axial flow
  • Fuel type: Aviation Kerosene / JP-4

Performance

  • Maximum power output: 1,650 shp (1,230 kW) plus 320 lbf (1.4 kN) thrust ; 1,770 shp (1,320 kW) (equivalent) at 15,000 rpm
  • Overall pressure ratio: 6:1
  • Air mass flow: 21.5 lb/s (9.8 kg/s) at 15,000 rpm
  • Specific fuel consumption: 0.69 lb/(hp⋅h) (0.42 kg/kWh) (equivalent shaft horsepower)
  • Power-to-weight ratio: 2.08 hp/lb (3.42 kW/kg) (equivalent shaft horsepower)

See also Edit

Related development

Related lists

References Edit

  1. ^ a b . RAF Museum. Archived from the original on 16 November 2007. Retrieved 6 June 2008.
  2. ^ Gunston 1989, p.20.
  3. ^ a b c d Taylor, John W.R. FRHistS. ARAeS (1955). Jane's All the World's Aircraft 1955-56. London: Sampson, Low, Marston & Co Ltd.
  4. ^ Studio, Cicada. "Armstrong Siddeley Mamba". www.raafawa.org.au. Retrieved 16 March 2019.
  5. ^ Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 122–123.

Bibliography Edit

  • "Aero Engines 1954", Flight, www.flightglobal.com, p. 446, 9 April 1954, retrieved 4 November 2008
  • Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. ISBN 978-1-85260-163-8.

External links Edit

 
Wikimedia Commons has media related to Armstrong Siddeley Mamba.
  • Brossett, Gary. "Armstrong Siddeley Mamba and propeller". enginehistory.org. from the original on 24 December 2005. Retrieved 16 March 2019.
  • . aoxj32. Archived from the original on 2 July 2006. Retrieved 16 March 2019.

August 28, 2023
armstrong, siddeley, mamba, british, turboprop, engine, produced, armstrong, siddeley, late, 1940s, 1950s, producing, around, effective, horsepower, mambamamba, engine, display, sheffield, hallam, universitytype, turbopropnational, origin, united, kingdommanuf. 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 MambaMamba engine on display at Sheffield Hallam UniversityType TurbopropNational origin United KingdomManufacturer Armstrong SiddeleyFirst run April 1946Major applications Boulton Paul BalliolA W ApolloShort SeamewDeveloped into Armstrong Siddeley Double MambaArmstrong Siddeley AdderArmstrong Siddeley gas turbine engines were named after snakes Contents 1 Design and development 2 Variants and applications 3 Engines on display 4 Specifications ASMa 6 4 1 General characteristics 4 2 Components 4 3 Performance 5 See also 6 References 6 1 Bibliography 7 External linksDesign and development EditThe Mamba was a compact engine 1 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 1 and the Mamba was the first turboprop engine to power the Douglas DC 3 when in 1949 a Dakota testbed was converted to take two Mambas The Mamba was also developed into the form of the Double Mamba which was used to power the Fairey Gannet anti submarine aircraft for the Royal Navy This was essentially two Mambas lying side by side and driving contra rotating propellers separately through a common gearbox A turbojet version of the Mamba was developed as the Armstrong Siddeley Adder by removing the reduction gearbox 2 Variants and applications Edit The Armstrong Siddeley Mamba powered Douglas C 47B Dakota testbed in 1954 showing the slim outline of the MambasASMa 3 Mamba 3 Armstrong Whitworth Apollo Avro Athena Boulton Paul Balliol 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 3 ASMa 6 Mamba 3 Short Seamew ASMa 7 Mamba A version for civil applications 3 Swiss Mamba SM 1 aft turbofan variant EFW N 20 Mamba 112 ASMa 6 Engines on display EditAn Armstrong Siddeley Mamba is on static display at the Midland Air Museum Coventry Airport Warwickshire at the Royal Air Force Museum Cosford and at the East Midlands Aeropark A Mamba is also on display at the Aviation Heritage Museum Western Australia 4 A Swiss Mamba SM 1 is on display at the Flieger Flab Museum Dubendorf A Mamba is also on display at the Hertha Ayrton STEM Centre Sheffield Hallam University UK Specifications ASMa 6 Edit Mamba and propeller from the Apollo airlinerData from Aircraft engines of the World 1957 5 General characteristics Type Turboprop Length 90 2 in 2 290 mm Diameter 33 in 840 mm Frontal area 5 9 sq ft 0 55 m2 Dry weight 850 lb 390 kg Components Compressor 11 stage axial flow Combustors Annular combustion chamber with 24 vapourising burners Turbine 3 stage axial flow Fuel type Aviation Kerosene JP 4Performance Maximum power output 1 650 shp 1 230 kW plus 320 lbf 1 4 kN thrust 1 770 shp 1 320 kW equivalent at 15 000 rpm Overall pressure ratio 6 1 Air mass flow 21 5 lb s 9 8 kg s at 15 000 rpm Specific fuel consumption 0 69 lb hp h 0 42 kg kWh equivalent shaft horsepower Power to weight ratio 2 08 hp lb 3 42 kW kg equivalent shaft horsepower See also EditRelated development Armstrong Siddeley Double Mamba Armstrong Siddeley AdderRelated lists List of aircraft enginesReferences Edit a b Aero Engine Information RAF Museum Archived from the original on 16 November 2007 Retrieved 6 June 2008 Gunston 1989 p 20 a b c d Taylor John W R FRHistS ARAeS 1955 Jane s All the World s Aircraft 1955 56 London Sampson Low Marston amp Co Ltd Studio Cicada Armstrong Siddeley Mamba www raafawa org au Retrieved 16 March 2019 Wilkinson Paul H 1957 Aircraft engines of the World 1957 15th ed London Sir Isaac Pitman amp Sons Ltd pp 122 123 Bibliography Edit Aero Engines 1954 Flight www flightglobal com p 446 9 April 1954 retrieved 4 November 2008 Gunston Bill 1989 World Encyclopaedia of Aero Engines 2nd ed Cambridge England Patrick Stephens Limited ISBN 978 1 85260 163 8 External links Edit Wikimedia Commons has media related to Armstrong Siddeley Mamba Brossett Gary Armstrong Siddeley Mamba and propeller enginehistory org Archived from the original on 24 December 2005 Retrieved 16 March 2019 ARMSTRONG SIDDELEY aoxj32 Archived from the original on 2 July 2006 Retrieved 16 March 2019 Retrieved from https en wikipedia org w index php title Armstrong Siddeley Mamba amp oldid 1065843136 Variants and applications, wikipedia, wiki, book, books, library,

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