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The Rolls-Royce Pennine was a British 46-litre air-cooled sleeve valve engine with 24 cylinders arranged in an X formation. It was an enlarged version of the 22-litre Exe; a prototype engine was built and tested, but never flew.[1] The project was terminated in 1945, being superseded by the jet engine.[2]

Pennine
Type	X-24 air-cooled sleeve-valve piston aero-engine
National origin	United Kingdom
Manufacturer	Rolls-Royce Limited
First run	1945
Number built	1
Developed from	Rolls-Royce Exe

A 100-litre 5,000 hp X32 (twin-X16) version of the Exe/Pennine, originally known as the Exe 100, was to have become the Rolls-Royce Snowdon.[3]

Rolls-Royce air-cooled engines, intended for commercial transport aeroplane use, were named after British mountains, e.g. The Pennines and Snowdon.

Specifications (Pennine)

General characteristics

• Type: 24-cylinder supercharged air-cooled 90 degree X layout aircraft piston engine
• Bore: 5.4 in (137.1 mm)
• Stroke: 5.0 in (127 mm)
• Displacement: 2791 in³ (45.73 L)
• Length: 106 in (2692 mm)
• Width: 39 in (991 mm)
• Height: 37.5 in (952 mm)
• Dry weight: 2,850 lb (1,293 kg)

Components

• Valvetrain: Sleeve valve
• Supercharger: Gear-driven centrifugal type supercharger, single stage, two speed
• Fuel type: Petrol
• Cooling system: Pressure air-cooled

Performance

• Power output: 2,740 hp (2,043 kW) at 3,500 rpm, +12 psi boost at sea level
• Power-to-weight ratio: 0.96 hp/lb (1.58 kW/kg)

See also

• Rolls-Royce aircraft piston engines

Related development

• Rolls-Royce Exe

Comparable engines

• Allison V-3420
• Junkers Jumo 222
• Napier Sabre

Related lists

• List of aircraft engines

References

Notes

Bibliography

На других языках

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- [en] Rolls-Royce Pennine

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[it] Rolls-Royce Pennine

Il Rolls-Royce Pennine era un motore aeronautico sperimentale 24 cilindri ad X raffreddato ad aria, realizzato dalla britannica Rolls-Royce Limited.

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[ru] Rolls-Royce Pennine

Роллс-Ройс Пенайн (англ. Rolls-Royce Pennine) – британский 24-цилиндровый X-образный двигатель воздушного охлаждения с рабочим объёмом 46 л. Представлял собой увеличенную версию 22-литрового мотора Exe. Прототип прошёл наземные испытания, однако не летал[1]; проект свернули в 1945 г. в пользу турбореактивных двигателей[2].

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