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).
Page 3 of a letter discussing lateral and torsional engine vibration, recommending further investigation.
| Identifier | ExFiles\Box 63\4\ scan0083 | |
| Date | 4th September 1929 guessed | |
| 3. it agrees in frequency with the engine firing impulses over a certain speed range. This matter of lateral vibration is clearly one which calls for further investigation now that the air has been cleared somewhat as regards torsional vibration. Yours sincerely, B Carter wp. | ||