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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.
Design and development
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 developed as an expendable engine for powering production versions of the Jindivik
target drone, but, again like the J85, the limited-life materials and total-loss oil systems were replaced with standard systems for use in manned aircraft.
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.
Engines on display
Preserved Viper engines are on public display at the following......