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).
Query regarding the optimal sodium fill percentage for sodium-cooled valves, referencing an S.A.E. Journal article.
| Identifier | ExFiles\Box 158\5\ scan0026 | |
| Date | 18th March 1939 | |
| 1360 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}4/R.18.3.39. We see from a certain article in the S.A.E. Journal that it is said that sodium-cooled valves are more effective when the hollow space is 40% filled with sodium than when 80% filled. We should like to know what percentage is filled with sodium on our valves. Rm.{William Robotham - Chief Engineer} | ||