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).
EAC clutch, including comparisons, modification suggestions, and vibration analysis.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan85 | |
| Date | 19th February 1924 | |
| R.R. 403A (40 H) (SL 42 12-7-23). J.H.D. EXPERIMENTAL REPORT. Expl. No. 9480 REF: H23/LG19.2.24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to Wor.{Arthur Wormald - General Works Manager} FN. c. to BY.{R.W. Bailey - Chief Engineer} S E C R E T. EAC. CLUTCH. Attached herewith are comparisons of the 20 HP. and EAC. clutches. It will be seen that the inertia of the EAC. clutch brake is 5 or 6 times greater than the 20 HP. We think the clutch plate could stand being made considerably lighter. We are having one modified and reducing the rim thickness from .200" to .100". We also suggest that we might try a Duralumin plate. Whilst the oil is thick in the gearbox, the clutch stops readily but when the oil is hot it is difficult to change up. Retard vibrations. We have carried out further tests which go to prove that the vibration complained of is between the flywheel and the servo drum. Our tests show that the vibration is the same whether the servo brake is applied or not. We conclude, that applying the brake to the servo drum should effectively damp out any period beyond it. It would appear that the vibration starts from the engine because if we decelerate with the throttle wide open and the ignition switched off, the vibration disappears. Hs.{Lord Ernest Hives - Chair} | ||