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).
List of four main features required for engine improvement.
| Identifier | ExFiles\Box 83\4\ scan0217 | |
| Date | 19th May 1936 | |
| -2- The main features which we think are required are :- (1) Improved oil filtration. (2) Larger oil pump. (3) Improved relief valve system. (4) Improved oil control by altered ring design. All these parts have at different times been tested out, so that it should not be difficult to incorporate them on an engine. Ha/Rm.{William Robotham - Chief Engineer} | ||