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).
Specifications for road springs on the B.III model.
| Identifier | ExFiles\Box 100\1\ scan0201 | |
| Date | 26th October 1938 | |
| 446 By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} Rm{William Robotham - Chief Engineer}12/R.26.10.38. re: ROAD SPRINGS ON B.III. We have not finally decided upon the rating of the rear road springs which will ultimately be fitted to B.III. In order to enable the spring shackles and front spring mounting, rebound straps and jacks to be settled, however, we have laid down that the car will run with 3½" bump clearance and a maximum of 9½" total spring movement. We have proved that with 6" rebound the present jack is satisfactory. Whatever rating of spring is employed, we wish to use the long shackles. Rm.{William Robotham - Chief Engineer} | ||