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 eliminate 'servo jaggers' and 'thumping' in the braking system.
| Identifier | ExFiles\Box 67\1\ scan0020 | |
| Date | 5th January 1926 | |
| To Hs.{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design}. 18370 DA{Bernard Day - Chassis Design}2/M5.1.26. SERVO JAGGERS. X. 8370 X. 5370 Replying to Hs{Lord Ernest Hives - Chair}2/LG1.1.26., we went into this question very fully with R.{Sir Henry Royce}, and he did not agree at that time to putting flexibility into the servo operation in order to reduce jaggers, but preferred the experiment which we sent you on N.sch.2075., and on which we believe we have not yet had a report, that is to say, increasing the strength of the separating spring between the servo plates. There was also another experiment, namely, increasing the strength of the pull off springs on the back brakes, (Not on the front) and we believe we have not had a report on this either. This was to eliminate thumping. Do you not think that these two experiments ought first to be tried before we commit ourselves to flexibility in the engagement, which R.{Sir Henry Royce} after considerable discussion turned down? In the event of the above two experiments proving a failure, flexibility is the only remaining cure that we know of. When it was discussed it was intended to produce flexibility by reducing the dia. of the brake countershaft which crosses the gearbox. DA.{Bernard Day - Chassis Design} | ||