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).
Conclusions on gear train noise, identifying the dynamo pinion as the source and discussing potential design solutions.
| Identifier | ExFiles\Box 136\1\ scan0177 | |
| Date | 31th January 1936 | |
| (sheet 2) E.1/HP.31.1.36. CONCLUSIONS. We have collected information on the attention that this gear train requires in reaching the necessary standard of silence, and this leads to the conclusion that the dynamo pinion is the source of 95% of the trouble encountered. This is due to the inertia of the dynamo armature. A belt driven dynamo would get over this difficulty but this is not yet accepted as a desirable feature. In designing the Phantom III wheelcase we reduced the number of main timing gears to 4 which is the least which can be used on this type of engine retaining a positively driven dynamo. E.{Mr Elliott - Chief Engineer} | ||