![]() ![]() In Czechoslovakia it was built by Walter Engines and was known as the Pegas. In Italy Alfa Romeo Avio built both the Jupiter (126-RC35) and the Pegasus under licence, with the engine based on the Pegasus designated as the Alfa Romeo 126-RC34 with the civil version as the 126-RC10. ![]() It was used on the PZL.23 Karaś and PZL.37 Łoś bombers. Like the Jupiter before it, the Pegasus was also licensed by the PZL company in Poland. It was also used on the Anbo 41, Bristol Bombay, Saro London, Short Empire, Vickers Wellesley and the Westland Wallace. Some notable users of the Pegasus were the Fairey Swordfish, Vickers Wellington, and Short Sunderland. This gave rise to the claim "one pound per horsepower" reflecting the excellent power-to-weight ratio. This improved performance considerably from the Jupiter's 580 hp (430 kW), to the first Pegasus II with 635 hp (474 kW), to 690 hp (510 kW) in the first production model Pegasus III, and eventually to the late-model Pegasus XXII with 1,010 hp (750 kW) thanks to the two-speed supercharger (introduced on the Pegasus XVIII) and 100-octane fuel. The Pegasus was the same size, displacement and general steel/aluminium construction as the Jupiter, but various improvements allowed the maximum engine speed to be increased from 1,950 to 2,600 rpm for take-off power. īristol Pegasus fitted to a Fairey Swordfish The primary advantage was a much improved power-to-weight ratio due to better volumetric efficiency. The power of a piston engine can be calculated by multiplying the charge per cylinder by the number of cycles per second the Mercury improved both and thereby produced more power for a given size. Although having a capacity (25 L) almost 15% smaller, the Mercury produced about as much power as the Jupiter, through a combination of supercharging to improve the "charge", and various changes to increase the operating RPM. The Pegasus was designed by Sir Roy Fedden as the follow-on to the Bristol Aeroplane Company's very successful Bristol Jupiter, using lessons learned in development of the Mercury. Two Bristol Pegasus engines remain airworthy in 2010, powering Fairey Swordfish aircraft operated by the Royal Navy Historic Flight (became Navy Wings in March 2019) other examples are preserved and on public display in aviation museums. The Bristol Siddeley company reused the name many years later for the turbofan engine used in the Hawker Siddeley Harrier and which became known as the Rolls-Royce Pegasus when Rolls-Royce took over that company. Several altitude and distance records were set by aircraft using the Pegasus. Aircraft applications ranged from single-engine biplanes to the four-engined Short Sandringham and Sunderland flying boats. In contrast, by the end of production over 30,000 Pegasus engines had been built. Developed from the earlier Mercury and Jupiter engines, later variants could produce 1,000 horsepower (750 kilowatts) from its capacity of 1,750 cubic inches (28 L) by use of a geared supercharger.įurther developments of the Pegasus created the fuel-injected Bristol Draco and the diesel cycle Bristol Phoenix, both types being produced in limited numbers. Designed by Roy Fedden of the Bristol Aeroplane Company, it was used to power both civil and military aircraft of the 1930s and 1940s. The Bristol Pegasus is a British nine-cylinder, single-row, air-cooled radial aero engine. The red circles are temporary blanking plates removed when the exhaust manifold is fitted Preserved Bristol Pegasus on display at the Brooklands Museum. For the vectored-thrust engine produced by Bristol Siddeley, see Rolls-Royce Pegasus. ![]()
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