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Bristol Jupiter

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Bristol Jupiter engine

The Bristol Jupiter was a British 9-cylinder one-row piston radial engine built by Bristol Aeroplane Company. Originally designed late in World War I, a lengthy series of upgrades and developments turned it into one of the finest engines of its era. It was widely used on many aircraft designs though the 1920s and 30s. It was also built under license in France (as the Gnome-Rhône Jupiter), Poland (as the PZL Bristol Jupiter), Italy (as the Alfa Romeo 126-RC35)[1] and in the Soviet Union (as the M-22). Thousands of Jupiters of all versions were produced.

History

The Jupiter was designed during World War I by Roy Fedden of Cosmos Engineering. During the rapid downscaling of military spending after the war, Cosmos went bankrupt in 1920, and was eventually purchased by Bristol Aeroplane Company on the strengths of the Jupiter design and the encouragement of the Air Ministry. The engine matured into one of the most reliable on the market. Production started in 1918 and ceased in 1930.

The Jupiter was fairly standard in design, but featured four valves per cylinder, uncommon at the time. The cylinders were machined from steel forgings, and the cast heads were later replaced with aluminium alloy following studies by the RAE. In 1927, a change was made to a forged head due to the rejection rate of the castings.

In 1925, Roy Fedden started designing a replacement for the Jupiter. Using a shorter stroke to increase the rpm, and including a supercharger for added power, resulted in the Bristol Mercury of 1927. Applying the same techniques to the original Jupiter-sized engine in 1927 resulted in the Bristol Pegasus. Neither would fully replace the Jupiter for a few years.

The Jupiter is best known for powering the Handley Page HP.42 Hannibal airliners, which flew the London-Paris route in the 1920s. Other civilian uses included the de Havilland Giant Moth and Hercules, the Junkers G 31 (which would evolve into the famous Ju-52), and the huge Dornier Do X flying boat which used no less than twelve engines.

Military uses were less common, but included the parent company's Bristol Bulldog, as well as the Gloster Gamecock and Boulton Paul Sidestrand. It was also found in prototypes around the world, from Japan to Sweden.

The Jupiter saw widespread use in licensed versions, with fourteen countries eventually producing the engine. In France, Gnome-Rhone produced a version used in several local civilian designs, as well as achieving some export success. Siemens-Halske took out a license in Germany and produced several versions of increasing power, eventually resulting in the Bramo 323 Fafnir, which saw use in wartime models. In Japan, the Jupiter was license-built from 1924 by Nakajima, forming the basis of their own subsequent radial aero-engine design, the Kotobuki. The most produced version was in the Soviet Union, where their M-22 version powered the famous Polikarpov I-16, which was built in the thousands.

Specifications (Jupiter)

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Applications

The Jupiter is probably best known for powering the Handley Page HP.42 Hannibal airliners, which flew the London-Paris route in the 1930s. Other civilian uses included the de Havilland Giant Moth and Hercules, the Junkers G 31 (which would evolve into the famous Ju-52), and the huge Dornier Do X flying boat which used no less than twelve engines.

Military uses were less common, but included the parent company's Bristol Bulldog, as well as the Gloster Gamecock and Boulton Paul Sidestrand. It was also found in prototypes around the world, from Japan to Sweden.

By 1929 the Bristol Jupiter had flown in 262 different aircraft types, it was noted in the French press at that year's Paris Air Show the Jupiter and its license-built versions were powering 80% of the aircraft on display.[2]

Note:[3]

Cosmos Jupiter

Bristol Jupiter

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Notes

  1. ↑ Alfa Aero Engines. aroca-qld.com. Retrieved on 2007-08-25.
  2. ↑ Gunston 2006, p.126.
  3. ↑ British aircraft list from Lumsden, the Jupiter may not be the main powerplant for these types

See also

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it:Bristol Jupiter de:Bristol Jupiter hu:Bristol Jupiter ja:ブリストル ジュピター ru:Bristol_Jupiter

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Bristol Jupiter".


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