Rolls-Royce RB108

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RB.108
RollsRoyceRB108.JPG
Preserved RB.108 at the Royal Air Force Museum Cosford
Type Turbojet
Manufacturer Rolls-Royce Limited
First run 1955
Major applications Short SC.1
Developed into Rolls-Royce RB145

The Rolls-Royce RB.108 was a British jet engine designed in the mid-1950s by Rolls-Royce specifically for use as a VTOL lift engine. It was also used to provide horizontal thrust in the Short SC 1.

United Kingdom Country in Europe

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign country located off the north-western coast of the European mainland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands. Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state, the Republic of Ireland. Apart from this land border, the United Kingdom is surrounded by the Atlantic Ocean, with the North Sea to the east, the English Channel to the south and the Celtic Sea to the south-west, giving it the 12th-longest coastline in the world. The Irish Sea separates Great Britain and Ireland. The United Kingdom's 242,500 square kilometres (93,600 sq mi) were home to an estimated 66.0 million inhabitants in 2017.

Jet engine reaction engine which generates thrust by jet propulsion

A jet engine is a type of reaction engine discharging a fast-moving jet that generates thrust by jet propulsion. This broad definition includes airbreathing jet engines. In general, jet engines are combustion engines.

Rolls-Royce Limited 1906-1987 automobile and aerospace manufacturer in the United Kingdom

Rolls-Royce was a British luxury car and later an aero-engine manufacturing business established in 1904 by the partnership of Charles Rolls and Henry Royce. Building on Royce's reputation established with his cranes they quickly developed a reputation for superior engineering by manufacturing the "best car in the world". The First World War brought them into manufacturing aero-engines. Joint development of jet engines began in 1940 and they entered production.

Contents

Design and development

The RB108 was the first direct-lift turbojet produced by Rolls-Royce. It originated from a VTOL concept in which Alan A. Griffith proposed using a small number of specialised lift engines in a VTOL aircraft, separate from the engines which provided forward propulsion. Its power output (thrust) was not high enough for use as a practical engine in a production aircraft [1] and was used only for research into VTOL. It was constructed from conventional materials. The next engine, the RB162, would have a compressor built mainly from glass-fibre composite and have a higher T/W ratio. The RB108 bearings and oil system were designed to operate with an engine attitude envelope which covered engine and aircraft tilting while transitioning between hovering and forward flight. When a fifth engine was installed in the SC.1 to provide forward thrust it had to be mounted at about 45 degrees to remain within the envelope. The exhaust was directed horizontally with a curved jetpipe.

Alan Arnold Griffith was the son of Victorian science fiction author George Griffith and an English engineer. Among many other contributions he is best known for his work on stress and fracture in metals that is now known as metal fatigue, as well as being one of the first to develop a strong theoretical basis for the jet engine. Griffith's advanced axial-flow turbojet engine designs, were integral in the creation of Britain's first operational axial-flow turbojet engine, the Metropolitan-Vickers F.2 which first ran successfully in 1941. Griffith however had little direct involvement in actually producing the engine, after he moved in 1939 from leading the engine department at the Royal Aircraft Establishment to start work at Rolls Royce.

Bearing (mechanical) machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts

A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. Most bearings facilitate the desired motion by minimizing friction. Bearings are classified broadly according to the type of operation, the motions allowed, or to the directions of the loads (forces) applied to the parts.

Lubrication process or technique employed to reduce friction between, and wear of one or both, surfaces in proximity and moving relative to each other, by interposing a substance called a lubricant in between them

Lubrication is the process or technique of using a lubricant to reduce friction and/or wear in a contact between two surfaces. The study of lubrication is a discipline in the field of tribology.

Applications

The RB.108 was used in the Short SC.1, which used four for lift with an additional one mounted at an angle at the rear for propulsion, and the Mirage Balzac, which used eight vertically mounted RB.108s for lift. The Vereinigte Flugtechnische Werke (VFW) SG 1262 used five RB.108s, three mounted in tandem on the centreline, with one RB.108 either side.

Short SC.1

The Short SC.1 was the first British fixed-wing vertical take-off and landing (VTOL) jet aircraft. It was developed by Short Brothers. It was powered by an arrangement of five Rolls-Royce RB108 turbojets, four of which were used for vertical flight and one for conventional horizontal flight. The SC.1 had the distinction of being the first British fixed-wing VTOL aircraft and the first one to transition between vertical and horizontal flight modes; it was also the first VTOL-capable aircraft with a fly-by-wire control system.

Vereinigte Flugtechnische Werke (VFW) was a German aerospace manufacturer formed by the 1964 merger of Focke-Wulf and Weser Flugzeugbau GmbH (Weserflug). The formation of VFW was a natural outcome of the 1961 rocket technology development alliance between the two merger partners and Hamburger Flugzeugbau (HFB) in the Entwicklungsring Nord (ERNO) group.

The RB.108 was also the intended powerplant for several other VTOL aircraft designs, including one by Dornier.

Dornier Flugzeugwerke aircraft manufacturer

Dornier Flugzeugwerke was a German aircraft manufacturer founded in Friedrichshafen in 1914 by Claude Dornier. Over the course of its long lifespan, the company produced many designs for both the civil and military markets.

A similar lift jet was designed by Bristol Siddeley, the BS.59, with a thrust of 8,000 lb the engine was intended for the projected Focke-Wulf Fw 260. [2]

Bristol Siddeley 1959-1968 aircraft engine manufacturer in the United Kingdom

Bristol Siddeley Engines Ltd (BSEL) was a British aero engine manufacturer. The company was formed in 1959 by a merger of Bristol Aero-Engines Limited and Armstrong Siddeley Motors Limited. In 1961 the company was expanded by the purchase of the de Havilland Engine Company and the engine division of Blackburn Aircraft. Bristol Siddeley was purchased by Rolls-Royce Limited in 1966.

The Focke-Wulf Fw 260 Flamingo and Focke-Wulf Fw 300 were a pair of related VTOL airliner projects, designed by Focke-Wulf during the early 1960s. Neither aircraft was built.

Specifications (RB.108)

Data fromAircraft engines of the World 1964/65. [3]

General characteristics

Components

Performance

No bleed air: 2,500 lbf (11 kN) at 17,500 rpm
11% Bleed air: 2,210 lbf (9.8 kN) at 17,500 rpm (4.3 lb/s (2.0 kg/s) bleed)

See also

Related development

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References

Notes

  1. Rolls-Royce From The wings 1925-1971 Military Aviation, R.W.Harker, Oxford Illustrated Press Ltd., ISBN   0 902280 38 4, p.121
  2. http://www.flightglobal.com/pdfarchive/view/1962/1962%20-%201015.html
  3. Wilkinson, Paul H. (1964). Aircraft engines of the World 1964/65 (21st ed.). London: Sir Isaac Pitman & Sons Ltd. p. 138.

Bibliography