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).
Modifications and improvements for the pedal mechanism on Wraith and Bentley V models.
| Identifier | ExFiles\Box 147\5\ scan0271 | |
| Date | 1st December 1938 | |
| H35 also .635 To Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} c. to Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} c. to Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}10/JH.1.12.38. PEDAL MECHANISM. Attached is print of Rm.{William Robotham - Chief Engineer}567, in which endeavour is made to compare the various merits of the systems used on Wraith and B.V. etc. together with suggestions for possible improvements. Wraith. Fig. A shows diagramatically the present standard and Fig. A1 a suggested modification which appears to reduce the friction by about 40% but as the modification has not yet been laid out in detail, it is not known whether or not it can be economically applied to the existing chassis. No alteration in ratio is suggested. Bentley V etc. Fig. C shows diagramatically the arrangement to drg. FCD.519, as used on S.B.V. etc. Fig. D suggests modifications with the object of reducing friction, pedal pressure and pedal travel, the two latter being made possible by altering the ratio to take advantage of the lighter thrust springs and different finger ratio of the Long clutch. It will be noted that although the Long and B. & B. clutches CAN be used interchangeably, with reasonably good results, actually to get the best results a slight change in the ratio is desireable, as will be seen from the 'remarks' column for C & D on the attached print, and when the Long Clutch is used we recommend this modification. We suggest that only the upper of the three links need be made adjustable, the tie rod and the lower link being made solid as no adjustment is necessary. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||