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).
Experiments to cure 'servo jaggers' and thumping issues by modifying springs and camshaft flexibility.
| Identifier | ExFiles\Box 67\1\ scan0021 | |
| Date | 28th January 1926 | |
| 48370 To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rml/LG28.1.26. SERVO JAGGERS. With reference to DA{Bernard Day - Chassis Design}2/M5.1.26. We have carried out the experiments you suggest in N.sch.205. We find that fitting the stronger springs between the servo plates does not have any consistent or appreciable effect on the servo jaggers. With regard to thumping, the effect of the stronger spring is to produce late thumps and eliminate early thumps. The auxiliary spring fitted to the swinging arm has no effect on servo jaggers. It affects thumping in much the same way as the stronger spring between the servo plates. Stronger pull off springs on the rear are also unsuccessful in curing the servo jaggers. The only consistent and complete cure for servo jaggers which we have so far tried, is the introduction of flexibility on the camshaft. This, as we believe you already know, is carried out by introducing a rubber ring at the back of the thrust race. This is an absolute consistent cure for servo jaggers. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||