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).
Instruction to use 30° servo cams instead of 33° on future experimental chassis due to the use of VG.90 servo linings.
| Identifier | ExFiles\Box 152\2\ scan0254 | |
| Date | 13th April 1939 | |
| 1294 - HH1 + XH1 To Da.{Bernard Day - Chassis Design} c. to HPS.{Horace Percy Smith - Experimental Factory Mgr} Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}10/JH.13.4.39. B.V. & B.50. Servo. In view of the fact that we find it advisable to use VG.90 servo linings which are now instructed, will you please instruct that all future experimental chassis are fitted with 30° instead of 33° servo cams. This also applies to all chassis fitted with Hydraulic brakes to the front. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems} | ||