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By 1933, the problems had been worked out and the Perseus went on to become the first sleeve valve aero-engine in the world, to be put into large quantity production. [2] The result was a Bristol Mercury-sized engine adapted to the sleeve valve system, the Perseus, and its smaller cousin, the Bristol Aquila.
The Bristol Hercules is a 14-cylinder two-row radial aircraft engine designed by Sir Roy Fedden and produced by the Bristol Engine Company starting in 1939. It was the most numerous of their single sleeve valve ( Burt-McCollum , or Argyll , type) designs, powering many aircraft in the mid- World War II timeframe.
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As built, the Botha I was powered by a pair of Bristol Perseus X radial engines, each driving a de Havilland Type 5/11 Hydromatic three-bladed constant-speed propeller. The engines, mounted on the central section of the wing in wide-chord cowlings, were fitted with controllable cooling grills. [4]
Known as the Bristol Orion, a name used previously for a variant of the Jupiter engine and later re-used for a turboprop, this development was also a two-row, 18 cylinder sleeve valve engine, with the displacement increased to 4,142 cu in (67,875.2 cm 3) [6.25 in × 7.5 in (159 mm × 191 mm)], nearly as large as the American Pratt & Whitney R ...
The Aquila was a nine-cylinder single-row radial aircraft engine designed by the Bristol Engine Company starting in 1934. A sleeve valve engine, its basic design was developed from the Bristol Perseus. The Aquila was never used in production, but further developments led to the Bristol Hercules, Bristol Taurus, and Bristol Centaurus.
The S.30 series was outfitted with four Bristol Perseus XIIc sleeve valve engines in the place of the Pegasus engines; the Perseus engines were more efficient but provided a lower power output of 890 horsepower (660 kW), but the decrease in developed thrust was effectively compensated for via the adoption of smaller diameter nacelles which had ...
Fedden and Butler immediately turned to such a design, adapting the Mercury to become the Bristol Aquila, and the Pegasus as the Bristol Perseus. However, both of these engines quickly found themselves at the "low end" of the power spectrum as ever-larger aircraft designs demanded ever-larger engines to power them.