Rolls-Royce Pennine
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| 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 |
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the 22-litre Exe; a prototype engine was built and tested, but never flew.[1] The project was terminated in 1945, being superseded by the jet engine.[2]
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.