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).
Weight comparison between the Wraith III and Silver Wraith frames and front suspensions.
| Identifier | ExFiles\Box 109\1\ scan0075 | |
| Date | 14th November 1938 | |
| ->3- Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham}3/MH.{M. Huckerby}14.11.38. For the purpose of comparing the weight of Wraith III and Silver Wraith frames, the weight of the front suspension is added to each because the Silver Wraith frame includes several pieces which are part of the suspension on Wraith III. Weight Weight (lbs) (lbs) Silver Wraith frame with 330 Wraith III frame. 347 same torsional strength This includes two cross as Wraith III members not on Silver Wraith, about 11 lbs. 336 but has not body mounting brackets present on Silver Wraith, about 10 lbs. 346 Front Suspension 180 Front Suspension 230 --- --- 510 576 510 --- 66 === So there is a nett saving of 66 lbs. in the frame and front suspension of Silver Wraith. Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham} | ||