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).
Providing comments on front suspension design, specifically regarding Harris Bushes and spring washers.
| Identifier | ExFiles\Box 110\3\ scan0043 | |
| Date | 22th January 1941 | |
| 1030 746 To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/GB. Rm{William Robotham - Chief Engineer}/GB.8/ET.22.1.41 FRONT SUSPENSION MYTH. ------------------------- Here are some comments on PL.423, which is described in EV{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}1/ET.7.12.40. The Harris Bushes at the outer ends of the upper triangle levers are not compressed as drawn and wear out extremely rapidly. EV{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} is in communication with the makers as to suitable design modifications here. We would like to see the spring washers under the main damper holding bolts replaced by plain washers. The reason for this is that English spring washers are thicker at bore than at the outside diameter, due to the wire being of trapezoidal section after rolling. There is a danger that the stress in the aluminium under the spring washers may be above the creep stress and below the elastic limit, so that bolt tightness would be reduced in time. Rm{William Robotham - Chief Engineer}/GB. | ||