1950s British turbojet aircraft engine From Wikipedia, the free encyclopedia
The Armstrong Siddeley Viper is a British turbojet engine developed and produced by Armstrong Siddeley and then by its successor companies Bristol Siddeley and Rolls-Royce Limited. It entered service in 1953 and remained in use with the Royal Air Force, powering its Dominie T1 navigation training aircraft until January 2011.[1]
The design originally featured a seven-stage compressor based on their Adder engine — the Viper is in effect a large-scale Adder.
Like the similar J85 built in United States, the Viper was originally developed as an expendable engine for production versions of the Jindivik target drone. Like the J85, the limited-life components and total-loss oil systems were replaced with standard systems for use in crewed aircraft.[2]
Because it was initially developed as an expendable engine, the Viper was subject to many recurring maintenance issues. This led to the development of the first Power by the Hour program in which operators would pay a fixed hourly rate to Bristol Siddeley for the continual maintenance of the engines.[3]
In the 1970s, Turbomecanica Bucharest and Orao Sarajevo acquired the license for the Viper engine, which propelled various Romanian and Yugoslav built aircraft.[4][5]
Data from:Jane's All the World's Aircraft 1955-56,[6] Jane's all the World's Aircraft 1959-60,[7] Jane's All the World's Aircraft 1962-63[8]
ASV.1
Short life design study; 1,145lbf (5.09kN).
ASV.2
Developed short life version, first run in April 1951; 1,145lbf (5.09kN).
ASV.3
(Mk.100) Short life for missile/target applications, flight-tested in the tail of an Avro Lancaster November 1952; 1,640lbf (7.30kN).
ASV.4
Short life for missile/target applications first run in 1952, 1,750lbf (7.78kN).
ASV.5
(Mk. 101) Extended life version for crewed aircraft.[6]
ASV.6
Short life for missile/target applications; 1,900lbf (8.45kN).
ASV.7
ASV.7/R
ASV.7 with re-heat; 2,470lbf (10.99kN).
ASV.8
(became Viper 8 and Mk.102); Long-life version rated at 1,750lbf (7.78kN) for Jet Provost T Mk.3.
ASV.9
(became Viper 9 and Mk.103) Similar to ASV.8 with improved turbine materials; 2,000lbf (8.90kN).
ASV.10
Long-life version with re-designed Sapphire-style compressor first run in January 1956; 1,900lbf (8.45kN).
ASV.11
(became Viper 11 and Mk.200) ASV.10 with increased mass-flow; 2,500lbf (11.12kN).
ASV.12
(became Viper 12) up-rated ASV.11 with higher JPT and rated at 2,700lbf (12.01kN)