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The Bentley BR.1 was a British rotary aircraft engine of the First World War. Designed by the motor car engine designer W. O. Bentley, the BR.1 was built in large numbers, being one of the main powerplants of the Sopwith Camel.
| BR1 | |
|---|---|
 | |
| Preserved Bentley BR1 at the Midland Air Museum | |
| Type | Rotary engine |
| Manufacturer | Humber Limited |
| Major applications | Sopwith Camel |
| Developed from | Clerget 9B |
Design and development
The 130 horsepower (97 kW) Clerget 9B was an important engine for the British Royal Naval Air Service and Royal Flying Corps, being license-produced in Britain and powering a number of important British aircraft, including the Sopwith Camel. However, at £907 a copy it was expensive, and prone to overheating, so the Admiralty asked Lieutenant W. O. Bentley, an established pre-war engine designer,[1] to produce a modified version to solve these problems.[2]
Bentley came up with his idea of an engine - fitted with aluminium cylinders with cast iron liners, and aluminium pistons. Dual ignition was introduced to improve reliability (much as the 160 CV Gnome 9N had already been), and the stroke increased to 6.7 inches (17 cm) which allowed power to be increased to 150 horsepower (110 kW).[3] The cost of the engine was also reduced, falling to £605 per engine.[2]
The resulting engine, initially known as the A.R.1 for "Admiralty Rotary", but later called the BR.1 ("Bentley Rotary") was manufactured in quantity, although initially against Admiralty orders. It was standardised for the Camel in RNAS squadrons, but unfortunately there were never enough to entirely replace the older and more expensive Clerget engine in British service, and most RFC Camel squadrons continued to use Clerget engines; in fact licensed production of the Clerget continued.[3]
The BR.1 was developed as the BR.2, a heavier, more powerful engine, which powered, among other types or aircraft, the Camel's eventual replacement, the Sopwith Snipe.
Applications
Specifications
Data from Jane's Fighting Aircraft of World War I [4]
General characteristics
- Type: 9-cylinder air-cooled rotary engine
- Bore: 4.72 inches (120 mm)
- Stroke: 6.69 inches (170 mm)
- Displacement: 1,055.9 cu in (17.303 L)
- Dry weight: 397 pounds (180 kg)
Components
- Cooling system: Air-cooled
Performance
- Power output: 150 bhp (110 kW) at 1,250 rpm
- Fuel consumption: 11 gallon/hr (50 L/hr)
- Oil consumption: 12 pints/hr (6.8 L/hr)
- Power-to-weight ratio: 0.38 bhp/lb
See also
Related development
Comparable engines
- Clerget 9B
- Clerget 9Z
- Gnome Monosoupape 9 Type N
- Le Rhone 9J
Related lists
References
- Barstow, Donald (1978). W.O. Bentley - Engineer. Sparkville, Somerset, UK: Haynes publications. ISBN 0-85429-215-2.
- Gunston, Bill (1999). The Development of Piston Engines (Second ed.). Sparkville, Somerset, UK: Patrick Stephens. ISBN 1-85260-599-5.
- Gunston, Bill (1986). World Encyclopedia of Aero Engines. London: Guild Publishing.
- Jane's Fighting Aircraft of World War I. London: Random House. 2001. p. 274. ISBN 1-85170-347-0.
External links
На других языках
[de] Bentley BR1
Der Bentley BR.1 war ein britischer Umlaufmotor für Flugzeuge des Ersten Weltkriegs. Entwickelt wurde er von Walter Owen Bentley, der schon vor dem Krieg als Konstrukteur von Fahrzeugmotoren erfolgreich war. Der BR.1 wurde in großen Stückzahlen produziert und war einer der Standardmotoren der Sopwith Camel.- [en] Bentley BR1
[it] Bentley BR1
Il Bentley BR1 era un motore aeronautico rotativo a 9 cilindri raffreddato ad aria prodotto dall'azienda britannica Bentley Motors Limited durante la prima guerra mondiale. Il motore fu progettato da W.O. Bentley e venne prodotto in un grande numero di esemplari. Il BR1 venne impiegato anche sul Sopwith Camel.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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