Napier Culverin

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The Napier Culverin was a licensed built version of the Junkers Jumo 204 six-cylinder vertically opposed liquid-cooled diesel aircraft engine built by Napier & Son. The name is derived from the French word, culverin, for an early cannon or musket.^[1] First flown in 1938, the engine went into limited production, with testing carried out on a Blackburn Iris V biplane flying-boat aircraft and Fairey IIIF biplane.^[1]

Design

The six cylinders were arranged vertically. Two crankshafts were located at the top and bottom of the engine and coupled together by gears. The inlet and exhaust ports were controlled by the pistons, as in a petrol-fuelled two-stroke engine.

Specifications (Culverin)

Data from ^[1]

General characteristics

Type: 12-piston 6-cylinder vertical opposed-piston liquid-cooled diesel engine.
Bore: 4.75 in (120.65 mm)
Stroke: 8.25 in (209.55 mm)
Displacement: 1,737 cu in (28.5 L)
Dry weight: 1,785 lb (809.6 kg)

Components

Valvetrain: Piston ported
Fuel system: Fuel injected
Fuel type: Diesel oil
Cooling system: Liquid cooled
Reduction gear: Spur geared, reduction ratio 0.6935:1, right hand tractor
Starting system: Compressed air starter

Performance

Power output: 821 hp at 2,050 rpm
Power-to-weight ratio: 0.46 hp/lb

References

Notes

↑ 1.0 1.1 1.2 Lumsden 2003, p.170.

Bibliography

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

External links

Photo of a Napier Culverin at Napierheritage.org

v t e Napier aero engines

Piston engines	Cub Culverin Dagger Javelin Lion Rapier Sabre

Turboprop / Turboshaft	Coupled Naiad Eland Gazelle Naiad

Turbo-compound	Nomad

Gas-generator	Oryx

Rocket	Scorpion

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