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).
Note on engine vibration intensity observed outside the normal cruising range.
| Identifier | ExFiles\Box 63\4\ scan0116 | |
| Date | 6th May 1930 | |
| -2- Hs{Lord Ernest Hives - Chair}/Vl.{V. Lewis / Mr Valentine}1/ML.6.5.30.Contd. 740 R.P.M. was the position at which the vibrations reached maximum intensity, and as this is not within the normal cruising range of the engine we do not consider that it is of any importance. Hs{Lord Ernest Hives - Chair}/VH. | ||