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).
Issues and proposed modifications for the Phantom III clutch pedal travel.
| Identifier | ExFiles\Box 93\3\ scan0104 | |
| Date | 22th April 1936 | |
| L.H. Smith. X317 Ba. c.c. Eg Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} E/HDY.{William Hardy}1/HP.22.4.36. re E.2/HP.21.4.36 - Phantom III Clutch. With regard to the clutch pedal travel on the Phantom III, the limits are the floorboards upwards and the cross and crankcase downwards. We have examined 32-EX and 33-EX and find that in both cases there is a loss of about 1" of pedal travel compared with our N.Sch.4404. Instead of there being 5.75" measured as a chord at the centre of the pedal plate there is about 4.75". It appears that there are two sources of loss (a) .5" compressed thickness of carpet under the pedal plate not allowed for on N.Sch.4404 and (b) a gas tight device on the underside of the floorboard which takes up more space than that shown on N.Sch.4404. The remedy for (a) is to lengthen the pedal stem and for (b) a modified gas tight scheme already instructed by N.Sch.4790. We will instruct the necessary lengthening of the pedal stem. When the above modifications are both in use the pedal plate will be 1" further back than it is now on 32-EX, which is the amount suggested as practicable in E.2/HP.21.4.36. If any further backward movement can be tolerated it would appear that it can only be obtained by alteration to the floorboards and for every 1" extra travel, the floorboard comes back 1" and the pedal plate 2". 32-EX is said to have a clutch disc with an abnormal amount of run-out or out of truth. The Experimental Department are taking up the question of excessive run-out with Messrs. Borg and Beck and expect to secure an improvement. We understand from them that there is also the possibility that with the rubberised friction material now being tried we could revert to our | ||