From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Photograph showing a rotor taken from a 4 1/8' bore by 6' stroke engine.
| Identifier | ExFiles\Box 134\1\ scan0232 | |
| Date | 17th May 1940 guessed | |
| Rotor taken from 4 1/8" bore by 6" stroke engine after approximately 1,000 hours running | ||