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).
Required ratios for the .650 Hypoid Semi Floating Axle for various models.
| Identifier | ExFiles\Box 114\1\ scan0167 | |
| Date | 18th January 1939 | |
| 1015 To HPS.{Horace Percy Smith - Experimental Factory Mgr} c. to By/NS.{Norman Scott} Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}24/JH.18.1.39. .650 Hypoid Semi Floating Axle PD.312. This is so far instructed for 12.B.V. 14.B.V. and 4.B.50. The ratios required are 10/43, 11/41 and 11/43. Three sets of each will enable us later to fit one of these axles to 3.B.50. with a suitable ratio. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||