Comparison of carburetter flooding on a gradient between the Wraith and 25/30 models.
| Identifier | ExFiles\Box 109\5\ scan0070 | |
| Date | 16th July 1938 | |
| 664 SECRET. Sg. {Arthur F. Sidgreaves - MD} from Rm. {William Robotham - Chief Engineer} Rml2/R.16.7.38. Wraith Carburetter Flooding on a Gradient. We have now completed some comparisons between the Wraith and the 25/30 flooding on a gradient. The present 25/30 starts to flood on an upward gradient of 1 in 14½, the Wraith on an upward gradient of 1 in 7½. When the carburetter does flood owing to the high pressure petrol pump used in the Wraith, rather more fuel is passed into the Induction Pipe. We cannot detect, however, that a hot start is any more difficult on the Wraith on a gradient of 1 in 7½ than on the 25/30. Rm. {William Robotham - Chief Engineer} | ||
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).