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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.
Sleeve valve closeup from a Bristol Centaurus Mark 175. Bristol Perseus. The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve valve engines saw use in a number of pre–World War II luxury cars and in the United States in the Willys-Knight car and light truck. They subsequently fell from ...
In Britain, Bristol produced both sleeve valved and conventional poppet valved radials: of the sleeve valved designs, more than 57,400 Hercules engines powered the Vickers Wellington, Short Stirling, Handley Page Halifax, and some versions of the Avro Lancaster, over 8,000 of the pioneering sleeve-valved Bristol Perseus were used in various ...
The result was a Bristol Mercury-sized engine adapted to the sleeve valve system, the Perseus, and its smaller cousin, the Bristol Aquila. The first production versions of the Perseus were rated at 580 horsepower (433 kW), the same as the Mercury model for that year, which shows that the sleeve system was being underexploited.
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This is an accepted version of this page This is the latest accepted revision, reviewed on 20 January 2025. British airliner with 2 piston engines, 1945 This article is about the post-World War II airliner. For the earlier single-engined amphibian, see Vickers Viking. This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to ...
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To achieve the fighter-like performance desired for the Beaufighter, Bristol suggested that they equip the aircraft with a pair of its new Hercules engines, capable of around 1,500 hp, in place of the 1,000 hp Bristol Taurus engines on the Beaufort. The Hercules was a considerably larger and more powerful engine which required larger propellers.