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).
The pedal pressure specifications for the 25 HP clutch.
| Identifier | Morton\M13.2\ img129 | |
| Date | 16th November 1931 | |
| To Da.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/AD16.11.31. x5480. With reference to your enquiry re pedal pressure required on the existing 25 HP. clutch and the spring pressure and pedal pressure at present being used. On the one clutch we have at present running in France, the load taken to start the pedal is 53 lbs and at the finish of the stroke it is 66 lbs. The attached diagrammatic sketch shows the leverages and we also send you drawing of the clutch spring. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||