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).
The replacement of hard dynamo coupling rubbers with softer ones on Wraith III units.
| Identifier | ExFiles\Box 108\2\ scan0152 | |
| Date | 14th September 1938 | |
| 600 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. RHC.{R. H. Coverley - Production Engineer} c. Roy{Sir Henry Royce}/Ms. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}14/MH.{M. Huckerby}14.9.38. (WRAITH III) DYNAMO COUPLING RUBBERS). Will you please fit the softer dynamo drive rubbers EW.1927 to Wraith III units as soon as these are available from the makers. Standardisation sheet W.3 has been issued for this modification. The improvement effected by the above is definitely noticeable in conjunction with the increased inertia camwheel. Rubbers of the original harder type (E.87011) already delivered for 'A' series Wraith, should be transferred for use on Ph.III. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||