Bristol Siddeley Engines Ltd (BSEL) was a British

aero engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbin ...

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 Blackburn Aircraft Limited was a British aircraft manufacturer from 1914 to 1963 that concentrated mainly on naval and maritime aircraft. History Blackburn Aircraft was founded by Robert Blackburn (aviation pioneer), Robert Blackburn and Jessy ...

. Bristol Siddeley was purchased by

Rolls-Royce Limited Rolls-Royce Limited was a British luxury car and later an aero-engine manufacturing business established in 1904 in Manchester by the partnership of Charles Rolls and Henry Royce. Building on Royce's good reputation established with his Crane ( ...

in 1966.

History

Bristol Siddeley Engines Limited was formed by the 1 April 1959 merge of Bristol Aero-Engines and Armstrong Siddeley Motors. These were the

manufacturing companies of the

Bristol Aeroplane Company The Bristol Aeroplane Company, originally the British and Colonial Aeroplane Company, was both one of the first and one of the most important British aviation companies, designing and manufacturing both airframes and aircraft engines. Notable ...

and the Hawker Siddeley Group. The share capital of Bristol Siddeley was held in equal proportions by these two parent organisations. At around the same time Bristol's aircraft manufacturing was being subsumed into the

British Aircraft Corporation The British Aircraft Corporation (BAC) was a British aircraft manufacturer formed from the government-pressured merger of English Electric, English Electric Aviation Ltd., Vickers-Armstrongs, Vickers-Armstrongs (Aircraft), the Bristol Aeroplane ...

along with those of

English Electric The English Electric Company Limited (EE) was a British industrial manufacturer formed after World War I by amalgamating five businesses which, during the war, made munitions, armaments and aeroplanes. It initially specialised in industrial el ...

and Vickers-Armstrong. Armstrong Siddeley Motors had been producing aero-engines and motor-cars since it had been formed in 1919 with the merger of Siddeley-Deasy and the Armstrong Whitworth Company. Bristol Aero-Engines had been formed in 1920 when the Bristol Aeroplane Company had taken over the assets of the Cosmos Engineering Company.Barnes 1988, pp. 30-31 On 6 May 1958 Bristol Siddeley Engines Limited was formed as a pilot company to bring about an alliance between the Bristol and Coventry concerns, and a full merger took effect from the beginning of April 1959. The purpose of the new company was to combine the research, engineering and manufacturing resources of the two great component companies to meet the changing demands of the aviation industry. The company was further strengthened in November 1961 when it acquired the full share capital of the de Havilland Engine Company Limited and Blackburn Engines Limited, both of which were formerly operating within the Hawker Siddeley Group. The aircraft side of Blackburn became part of Hawker Siddeley. Both of these companies had long histories in the aero-engine industry. The de Havilland Engine Company Limited had the de Havilland Sprite which was a rocket engine with a military type test certificate. In 1954, the company had produced the axial

turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and ...

Gyron of thrust, from which was descended the Gyron Junior series. The de Havilland Engine Company's portfolio included the (licensed) Gnome turboshaft. The Blackburn Aeroplane and Motor Company had entered the aero engine field in 1934 when the Cirrus-Hermes Engineering Company became part of the Blackburn and this became the Engine Division of Blackburn Aircraft and subsequently Blackburn Engines Limited. In 1952 an agreement was signed which enabled Blackburn Engines Limited to produce engines based on the Turbomeca range of small gas turbine engines. These were developed for use as airborne

auxiliary power unit An auxiliary power unit (APU) is a device on a vehicle that provides energy for functions other than propulsion. They are commonly found on large aircraft and naval ships as well as some large land vehicles. Aircraft APUs generally produce 115&n ...

s for large aircraft and they were also used as a ground starter unit in the British services. Bristol Siddeley was bought by

in 1966 for £63.6 million in order to prevent competition from a planned collaboration between BSEL,

Pratt & Whitney Pratt & Whitney is an American aerospace manufacturer with global service operations. It is a subsidiary of RTX Corporation (formerly Raytheon Technologies). Pratt & Whitney's aircraft engines are widely used in both civil aviation (especially ...

and

Snecma Safran Aircraft Engines, previously Snecma (''Société nationale d'études et de construction de moteurs d'aviation'') or Snecma Moteurs, is a French aerospace engine manufacturer headquartered in Courcouronnes and a subsidiary of Safran. It d ...

. Bristol Siddeley retained its own identity and marketing organization. Bristol Siddeley Engines Limited is still a listed but dormant company within the Rolls-Royce group.English Company No. 00604105 BRISTOL SIDDELEY ENGINES LIMITED
/ref>

Products

The company was one of the largest of its kind in the world
/ref> and offered a wider range of engines than any other manufacturer. Aero engines produced by the company included piston engines, turboprops, turboshafts, turbojets, turbofans, auxiliary power units, ramjets and liquid propellant rocket engines. Outside the aeronautical field its products were gas turbines for marine and industrial use, diesel engines, and automatic transmissions.

Aero engines

The

Patchway Patchway is a town and civil parish in South Gloucestershire, England, situated north-north west of central Bristol. The town has become an overflow settlement for Bristol and is contiguous with Bristol's urban area, along with the nearby towns ...

factory in South

Gloucestershire Gloucestershire ( , ; abbreviated Glos.) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by Herefordshire to the north-west, Worcestershire to the north, Warwickshire to the north-east, Oxfordshire ...

produced military aeroplane engines including the Olympus two-spool turbojet (from which the engine for

Concorde Concorde () is a retired Anglo-French supersonic airliner jointly developed and manufactured by Sud Aviation and the British Aircraft Corporation (BAC). Studies started in 1954, and France and the United Kingdom signed a treaty establishin ...

was developed), the

Orpheus In Greek mythology, Orpheus (; , classical pronunciation: ) was a Thracians, Thracian bard, legendary musician and prophet. He was also a renowned Ancient Greek poetry, poet and, according to legend, travelled with Jason and the Argonauts in se ...

turbojet for the

Folland Gnat The Folland Gnat is a British compact swept-wing subsonic aircraft, subsonic fighter aircraft that was developed and produced by Folland Aircraft. Envisioned as an affordable light fighter in contrast to the rising cost and size of typical comb ...

light fighter/trainer aircraft, the

Pegasus Pegasus (; ) is a winged horse in Greek mythology, usually depicted as a white stallion. He was sired by Poseidon, in his role as horse-god, and foaled by the Gorgon Medusa. Pegasus was the brother of Chrysaor, both born from Medusa's blood w ...

two shaft medium bypass ratio vectored thrust turbofan for the Hawker Siddeley P.1127/Kestrel/Harrier VSTOL ground attack aircraft, the

Proteus In Greek mythology, Proteus ( ; ) is an early prophetic sea god or god of rivers and oceanic bodies of water, one of several deities whom Homer calls the "Old Man of the Sea" (''hálios gérôn''). Some who ascribe a specific domain to Prote ...

turboprop for the

Bristol Britannia The Bristol Type 175 Britannia is a retired United Kingdom, British flight length, medium-to-long-range airliner built by the Bristol Aeroplane Company in 1952 to meet British civilian aviation needs. During development two prototypes were lo ...

airliner and the

Viper Vipers are snakes in the family Viperidae, found in most parts of the world, except for Antarctica, Australia, Hawaii, Madagascar, New Zealand, Ireland, and various other isolated islands. They are venomous and have long (relative to non-vipe ...

turbojet for the Hawker Siddeley HS.125. Bristol Siddeley had under development another vectored thrust turbofan, the "plenum chamber burner" (similar to an afterburner) equipped BS100, which was intended for the supersonic Hawker Siddeley P.1154 VSTOL fighter, but the project was cancelled in 1965. The two shaft BS143 was proposed for the MRCA (later the Tornado), but the takeover by RR caused the adoption of the three shaft RB199 instead. Hypersonics were explored in a shock tube near the High Altitude Test Plant (HATP) at Bristol, in support of BS1012 hypersonic engine thinking. High supersonic ramjets for long range defensive missiles were tested in the HATP (Ref TJ102 and TJ151/2).

Diesel engines

Bristol Siddeley also manufactured

diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...

s under licence from the German company

Maybach Maybach (, ) is a German luxury car brand owned by and a part of Mercedes-Benz AG. The original company was founded in 1909 by Wilhelm Maybach and his son Karl Maybach, originally as a subsidiary of ''Luftschiffbau Zeppelin GmbH'', and it was ...

. These were for installation in British Rail Class 42 and Class 52

locomotive A locomotive is a rail transport, rail vehicle that provides the motive power for a train. Traditionally, locomotives pulled trains from the front. However, Push–pull train, push–pull operation has become common, and in the pursuit for ...

s which were themselves based on licensed German designs but with as much British-built content as possible. The Maybach Diesel (MD) MD650, MD655 and MD870 series engines built by Bristol Siddeley were sophisticated in design, running at much higher speeds than normal diesels of their size and featured advanced construction such as a disc-webbed

crankshaft A crankshaft is a mechanical component used in a reciprocating engine, piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating Shaft (mechanical engineering), shaft containing one or more crankpins, ...

that ran in large

roller bearing In mechanical engineering, a rolling-element bearing, also known as a rolling bearing,ISO 15 is a bearing which carries a load by placing rolling elements (such as balls, cylinders, or cones) between two concentric, grooved rings called race ...

s, telescopic pipes to deliver cooling oil to the pistons and detachable piston crowns. The MD engines produced by BSEL included 16 basic engines in the range, which covered powers from 380 to 3,000 horsepower, and includes 4- and 6-cylinder in-line units, and 8, 12 and 16 V units. Each of these were pressure-charged, with or without intercooling. They were used with hydraulic transmission systems, in the Type 4 locos (with two MD650 engines of 1,152 bhp each) hauled the express trains of the Western Region of British Railways - e.g. the Bristolian and the Cornish Riviera. Several hundred more orders were placed by British Rail.(Ref TJ102). MD series engines were widely used in base load, intermittent and standby electricity generating sets, and were transported by rail up to the nominal 1200 kW size for a complete generator set. They were also employed in oil rigs and pumping sets.(Ref TJ151/2).

Motor cars

When the company was formed it also included the motor car companies Armstrong Siddeley Motors and

Bristol Cars Bristol Cars was a British manufacturer of hand-built luxury cars headquartered in Bristol, Bristol, England. It was formed from the car division of the Bristol Aeroplane Company after the World War II, Second World War and later became indepe ...

. It was soon decided to stop production of Armstrong Siddeley cars, as it was becoming uneconomic, with production of the only product, the Star Sapphire, ending in July 1960. In September 1960 Bristol Cars was sold. Subcontracted production of the Sunbeam Alpine sports car continued at Bristol Siddeley Engines in Coventry until 1962.

References

Sources

* Barnes, C.H. ''Bristol Aircraft since 1910''. London, England. Putnam. 1988. * Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989. * Bristol Siddeley TJ101, July 1960 * Bristol Siddeley TJ102, July 1960 * Bristol Siddeley TJ151/2, December 1962 * British Secret Projects , Ian Allan 2008

External links

Bristol Aero Collection
{{BristolAeroengines Manufacturing companies established in 1959 Manufacturing companies disestablished in 1966 Rocket engine manufacturers of the United Kingdom Defunct aircraft engine manufacturers of the United Kingdom Defunct companies based in Bristol Companies based in Coventry Defunct motor vehicle manufacturers of the United Kingdom Armstrong Siddeley 1959 establishments in England 1966 disestablishments in England 1966 mergers and acquisitions Marine engine manufacturers