10 Facts About Bristol Jupiter

Bristol Jupiter was a British nine-cylinder single-row piston radial engine built by the Bristol Aeroplane Company.

Bristol Jupiter was widely used on many aircraft designs during the 1920s and 1930s.

Turbo-supercharged version of the Bristol Jupiter known as the Orion suffered development problems and only a small number were produced.

Bristol Jupiter was designed during World War I by Roy Fedden of Brazil Straker and later Cosmos Engineering.

The first Bristol Jupiter was completed by Brazil Straker in 1918 and featured three carburettors, each one feeding three of the engine's nine cylinders via a spiral deflector housed inside the induction chamber.

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Bristol Jupiter was fairly standard in design, but featured four valves per cylinder, which was uncommon at the time.

The Bristol Jupiter VII introduced a mechanically-driven supercharger to the design, and the Bristol Jupiter VIII was the first to be fitted with reduction gears.

Bristol Jupiter saw widespread use in licensed versions, with fourteen countries eventually producing the engine.

In France, Gnome-Rhone produced a version known as the Gnome-Rhone 9 Bristol Jupiter that was used in several local civilian designs, as well as achieving some export success.

In Japan, the Bristol Jupiter was license-built from 1924 by Nakajima, forming the basis of its own subsequent radial aero-engine design, the Nakajima Ha-1 Kotobuki.