Bristol Draco

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The Bristol Draco was an air-cooled 9-cylinder radial engine from the British manufacturer Bristol Aeroplane Company. It was essentially a version of their famous Pegasus converted to use a fuel injection system.

The carburettor had only a simple butterfly valve, while two injection pumps supplied the cylinders with fuel, one handling four cylinders and the other, five. Injection was into the manifold before they split into the two intake valves for each cylinder. The engine was flight tested in a Westland Wapiti. Since the expenditure did not bring considerable improvements the development was stopped.

Specifications (Draco)

Data from Lumsden.^[1]

General characteristics

Type: Nine-cylinder air-cooled radial engine.
Bore: 5.75 in (146 mm)
Stroke: 7.5 in (190 mm)
Displacement: 1,753 cu in (28.7 L)
Length: 43.5 in (1,105 mm)
Diameter: 55.5 in (1,410 mm)
Dry weight: 1,093 lb (495.8 kg)
Designer: Roy Fedden

Components

Valvetrain: Overhead valve
Supercharger: Medium supercharged
Fuel system: Fuel injected
Cooling system: Air-cooled
Reduction gear: Geared epicyclic, reduction ratio 0.5:1, left hand tractor

Performance

Power output: 570 hp at 2,000 rpm
Compression ratio: 5.3:1
Power-to-weight ratio: 0.52 hp/lb

References

Wikimedia Commons has media related to Bristol piston engines.

Notes

↑ Lumsden 2003, p.114.

Bibliography

Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.

Bristol / Bristol Siddeley aero engines

Bristol Aeroplane Company
Piston engines (1920-1956)

Horizontally opposed engines:	Cherub

Radial engines:	Draco Hydra Jupiter Lucifer Mercury Neptune Orion Pegasus Phoenix Titan

Sleeve valve radial engines:	Aquila Centaurus Hercules Orion Perseus Taurus

Bristol Siddeley gas turbine
and rocket engines (1959-1966)

Turbojets / Turbofans:	Gyron Junior Olympus Orpheus Pegasus BS.100 Phoebus Viper

Turboprops / Turboshafts:	BS.360 Coupled Proteus Nimbus Orion Proteus Theseus

Ramjets:	Thor Odin

Rocket engines:	BS.605 Gamma Stentor

Designers

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