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).
Letter concerning clutch spring pressures, pedal leverage, and acceleration figures for a 25 HP vehicle.
| Identifier | ExFiles\Box 5a\3\ 03-page115 | |
| Date | 21th November 1931 | |
| G.{Mr Griffiths - Chief Accountant / Mr Gnapp} W. Hancock from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hotel de France, Chateauroux, Indre, France. YS840 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/AD21.11.31. I find that I was wrong about the clutch spring pressures and that the spring you have now got on the 25 HP. clutch should give you equal immunity from slipping to the 40/50, but with the existing standard springs you would be appreciably worse off. We therefore hope that you will be able to induce the clutch to function satisfactorily with C.54136 springs. At this end we are going to reduce the pedal pressure required to operate the clutch by altering the leverage. The loads you give us of 53 and 56 lbs were rather high compared with standard and possibly there is some binding taking place in the clutch. We should like to know at exactly what angle you took the loads on the pedal because unless they are at right angles to a line drawn between the pedal to the shaft they are likely to be misleading. We note the acceleration figures which we think are very good. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||