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).
Secret memo regarding oscillation issues in Wraith engines, proposing a comparative bench test against the 25/30 engine.
| Identifier | ExFiles\Box 108\2\ scan0044 | |
| Date | 4th March 1938 | |
| SECRET. To Rm.{William Robotham - Chief Engineer} from Sg.{Arthur F. Sidgreaves - MD} Copy to Hs.{Lord Ernest Hives - Chair} re Wraith Engines. Sg{Arthur F. Sidgreaves - MD}3/E4.3.38 600. ? In view of what was said at the conference the other day, I am rather disturbed as to why the modifications to the engine have run us into some trouble in connection with oscillation and I do hope that you will quickly carry out the suggestion made with a view to finding out how are the conditions in this respect different in the engine as compared with the 25/30. I gather that this could be fairly quickly done by a comparative test for oscillation between Wraith and 25/30 on the bench. Sg.{Arthur F. Sidgreaves - MD} | ||