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).
Request to investigate the design changes required to convert a 4¼-litre high-power engine into a 3½-litre unit.
| Identifier | ExFiles\Box 134\1\ scan0161 | |
| Date | 17th May 1939 | |
| 1129. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}2/R.17.5.39. Will you please go into the question of design necessary to convert the 4¼-litre high-power engine into a 3½-litre high-power unit. Rm.{William Robotham - Chief Engineer} | ||