Armstrong Siddeley Adder

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Type Turbojet
Manufacturer Armstrong Siddeley
First run November 1948
Developed from Armstrong Siddeley Mamba
Developed into Armstrong Siddeley Viper

The Armstrong Siddeley Adder was an early British turbojet engine developed by the Armstrong Siddeley company and first run in November 1948.[1]

Design and development[edit]

The Adder, a pure-jet derivative of the Armstrong Siddeley Mamba, was originally developed as an expendable engine to power the Jindivik 1 target drone. The engine was then developed into a longer-life engine before evolving into the more-powerful Armstrong Siddeley Viper.

The ASA.1 Adder was flight tested in the rear-turret position of the Avro Lancaster III SW342, the aircraft also having been previously modified and used for icing trials of the Mamba by Armstrong Siddeley's Flight Test Department at Bitteswell.


Specifications (Adder)[edit]

General characteristics

  • Type: Turbojet
  • Length: 73.3 in
  • Diameter: 28 in
  • Dry weight: 550 lb


  • Compressor: 10-stage Axial Flow
  • Combustors: six-can
  • Turbine: 2-stage axial
  • Fuel type: Aviation Kerosene


See also[edit]

Related development
Related lists



  1. ^ Gunston 1989, p. 20.


  • Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

Further reading[edit]

  • Turbine Test Beds by Brian Turpin - Part one - Aeroplane Monthly February 1980 issue

External links[edit]