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).
Rear spring specifications for the Silver Wraith chassis.
| Identifier | ExFiles\Box 109\1\ scan0142 | |
| Date | 26th July 1939 | |
| 666 + 1025 To Da{Bernard Day - Chassis Design}/JD.{J. Draper - Frames} from Rm{William Robotham - Chief Engineer}/HFP. Rm{William Robotham - Chief Engineer}/HFP.9/MH.{M. Huckerby}26.7.39. SILVER WRAITH REAR SPRINGS. The following springs will be fitted to Silver Wraith chassis:- 31.G.VII FW.1788 1200 lbs. 32.G.VII FW.1786 1100 lbs. 33.G.VII FW.1787 1150 lbs. Spring FW.1787 has a thickness of 2.880" at the centre with the interleaving in position. All the above springs have substantially the same thickness. Rm{William Robotham - Chief Engineer}/HFP. | ||