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).
Production test issues with the S.S. Chassis, covering the clutch brake, exhaust joint, and propeller shaft.
| Identifier | ExFiles\Box 65a\3\ scan0093 | |
| Date | 8th August 1929 | |
| x7770 Hs.{Lord Ernest Hives - Chair} c.c. to By.{R.W. Bailey - Chief Engineer} Mx{John H Maddocks - Chief Proving Officer}5/OG8.8.29 Re: S.S. Chassis. The following are points that are giving trouble during production test, and although the majority of these have been discussed with you verbally we think it will be of mutual benefit to list them. 1. Clutch brake. x /300 We find that the rate of depression of the pedal has considerable effect on the stopping of the clutch plate. If, with the clutch brake entirely disconnected the pedal is depressed suddenly, the clutch plate stops almost immediately; but if depressed slowly the plate continues to drag. This is due, we think, to the absence of any means of separating the driven member from the ferodo on the engine side. No matter how the brake is adjusted it cannot have any effect in the case where the pedal is depressed suddenly as the clutch already stops very quickly. 2. Exhaust joint. x/230. The sliding joint at the front end of the rear silencer is giving trouble owing, we think, to the external portion being too weak. It appears to expand and does not return to its original diameter, thus [causing - struck through] a serious exhaust blow. There is also considerable noise from the drain hole at the front end of the rear silencer. Is it essential that this hole is drilled? 3. Propeller shaft. x/340 The propeller shaft fouls the cross member under combined bump and torque conditions. We note that 'By' proposes to increase the thickness of the rubber buffer, but in the meantime a .25" aluminium packing is being fitted under the buffer, which will relieve but not entirely prevent the occurrence. | ||