Bristol Pegasus

The Pegasus was a 9 cylinder one-row radial aircraft engine designed as the follow-on to the Bristol Aeroplane Company's very successful Bristol Jupiter, following lessons learned in the Mercury effort.

The Pegasus was the same size, displacement and general steel/aluminium construction as the Jupiter, but other improvements allowed the RPM to be increased from 1950 to 2600 for take-off power. This improved performance considerably from the Jupiter's 580hp, to the first Pegasus II's with 635hp, to 690hp in the first production model III's, and eventually to the late-model XXII's 1010hp with improved superchargers (max take-off in all cases).

The most famous use of the Pegasus is on the Fairey Swordfish, and it was also used on the Bristol Bombay[?]. Like the Jupiter before it, the Pegasus was also licensed, but this time only by the PZL company in Poland. They used it on their PZL P.23[?] £oœ and PZL P.37[?] designs.

Specifications

For Pegasus X:

Bore / Stroke / Displacement: 5.75" x 7.5", 1753 cu in (28.7 litre)

Compression ratio: (unknown)

HP: 915 hp at 2600 RPM (max continuous), 960 hp at 2475 RPM (take-off)

Weight: 1005 lbs

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Bristol Pegasus is also a motor-racing club in Bristol.