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).
Underhanging the servo countershaft and modifying the damper to improve footwell space.
| Identifier | ExFiles\Box 84\2\ scan0024 | |
| Date | 4th March 1933 | |
| BY.{R.W. Bailey - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} X206 DA{Bernard Day - Chassis Design}2/M4.3.33. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} HS.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} HDY.{William Hardy} We have looked into the question of underhanging the servo countershaft and scissors levers on the above car in order to improve the space available for the wells for the feet on the driver's side. N. scheme 3700. attached herewith. The damper in a vertical position is necessary to do this and as R.{Sir Henry Royce} has already expressed a preference for this position it is suggested as a possible future development for the 25HP. also. It will be seen that apart from the damper itself the only modifications called for on the brake gear are a new sheet metal bridge piece and a new sheet metal lever for operating the damper. The brake leverages, which are taken from LeCs. and assumed to be the latest development, are unaffected. As we believe Expl. Dept. favour the use of a double acting damper for eliminating thumps as well as clanks, we have made some suggestions for this. We do not entirely understand how the damper illustrated in HS{Lord Ernest Hives - Chair}/LIDL/KT17832. can work, as considerable clearance must be allowed for the brakes wearing, and therefore for some time after they are working the compression ratio must be so small as we should think would give very little damping. We have suggested in the one sketch that the damper stroke should be reduced to only a little more than is needed for the pedal to reach the floorboards, relying on the brakes being properly adjusted when this happens. Alternatively we suggest in the other sketch that a damper could be provided having effective, but limited, damping for a little more than the normal brake clearance, and afterwards is able to move if it wants to by compressing a low rated spring. We have not shewn the proposed gland as the long piston rod fits look as though they should be effective seals, but one can be provided if found necessary. DA.{Bernard Day - Chassis Design} | ||