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).
Effectiveness and testing of different rear spring types for various car models.
| Identifier | ExFiles\Box 16\7\ Scan061 | |
| Date | 15th May 1928 guessed | |
| contd :- -2- frequency, though we believe the effectiveness of the shock absor- bers during large amplitude rear spring movements had something to do with this. With reference to the lighter type of rear spring fitted to 12-EX for test. This type of spring is illustrated in F.78615. Its weight is 64 lbs.; the corresponding standard spring weighs 82 lbs. Actually 12-EX was not the right weight for the springs fitted; they were only incorporated to obtain a figure for durability for the type. We do not know whether interest in this spring still continues, but it might be useful to use it as our standard 25% stiffer type i.e., it lowers the car 1" and saves weight with the same stress as standard owing to its reduced deflection. Certainly our experience on 15-EX has shewn us a stiffer spring is an advantage on cars such as the Barker open touring illustrated in last weeks 'Autocar'. We have satisfied both Summers and Skinner - open touring car drivers - with stiffer springs after they had complained of the standards. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||