Rolls Royce Viper

The Engine On Display

This engine is on display next to the Macchi MB326 trainer, in which type it was used. The annotation indicates it is a Mark 22-11, developing 2,500 lb thrust, and was manufactured in Australia under license. The note also describes it as a "Rolls Royce Viper", Rolls Royce being the last identity under which it was manufactured.

Type / History

Type Axial-flow turbojet
Manufacturer Armstrong Siddeley, Bristol Siddeley, then Rolls Royce
Introduced first run 1951, first use in an aircraft 1953.
Primary users RAF, Italian, Yugoslav and Brazilian Air Force,
RAAF, SAAF, plus many others

The Viper was initially designed and produced by the Armstrong Siddeley company as a scaled-down version of their Sapphire, reportedly with an intended use as the engine for the Australian Jindivik drone target aircraft. However, as demand grew for small jet engines to power jet trainer aircraft, it was upgraded to a more robust design. It was the chosen powerplant for not only the Macchi MB326, used by the RAAF, but also the British Jet Provost and the Yugoslav Soko Galeb, both also advanced trainers.

The Armstrong Siddeley company was taken over by the Bristol Aeroplane company in 1959-1960, becoming Bristol Siddeley, and it was in this guise that it was evaluated and ordered with the Macchi MB326 by the RAAF, in 1964-1965. Rolls Royce took over Bristol Siddeley in 1966, so it was under this manufacturer that deliveries were made to the RAAF.


Maximum thrust: 2,700 lb (1,225 kgf)
Weight: 549 lb (249 kg)