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).
Modification to the Wraith III spring drive unit by adding holes to the damper.
| Identifier | ExFiles\Box 10\3\ 03-page105 | |
| Date | 11th January 1938 | |
| c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rider 654. BY.2/G.11.1.38. WRAITH 111 UNITS (SPRING DRIVE). Referring to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/MH.{M. Huckerby}7.1.38. it is necessary to put through a modification adding the holes as suggested. In regard to the first six chassis which must not be delayed by unnecessary changes I am sending a copy of Rm.{William Robotham - Chief Engineer}485 direct to RHC.{R. H. Coverley - Production Engineer} pointing out that providing the damper is not built up, it will be worth while to add the holes, as they certainly will by eliminating erratic working of the damper justify their cost and the slight delay. The D.O. should specify the holes for general production after the first six chassis. BY BY.{R.W. Bailey - Chief Engineer} | ||