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).
Required poundage for the Wraith spring drive damper and requesting new, weakened springs for trial.
| Identifier | ExFiles\Box 10\3\ 03-page123 | |
| Date | 31th March 1938 | |
| 654 ? To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. By/OS. c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/MH.{M. Huckerby}31.3.38. WRAITH SPRING DRIVE DAMPER POUNDAGE. It has been ascertained on the road that a slipping load of 10 - 12 lbs. at a radius of 17½" gives the best all round results. The existing springs EW.1347 without any adjusting washers, (that is the lowest load) comes out in practice at an average of 13 - 15 lbs. at 17½" radius. Based on these results will you please instruct for reduced strength springs to give the new requirements. We should like to get an advanced set or two for experimental trial to confirm that they will be O.K. for production of the 100 sets. There will be no scrap entailed as the existing springs EW.1347 have not yet been produced and should be further held up pending our trial of the modified weakened springs. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||