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).
Failures and necessary adjustments for a vehicle's servo, brakes, and expander housing.
| Identifier | ExFiles\Box 111\3\ scan0221 | |
| Date | 5th September 1938 | |
| -2- (4) We have already informed you verbally of the failure of the obsolete type front expander housing. The failure might be due to direct load on the "on" stops, or bending due to the short plungers, or possibly side thrust due to hub float. We will have to see if we have any further trouble with the latest pieces. (5) The safety "on" stop on the rear brakes inter-mediate shaft bends when subjected to the loads which would occur if the rear rods failed. It must therefore be strengthened. (6) The new servo is too closely designed and comes to the end of its travel when all the expander wedges are at the limit of their travel. There is no allowance for carrier plate or any other sponge. The lever lengths, etc., need altering and allowance made for deflection and setting defects. In order to keep the same servo assistance with more travel the servo output will have to be increased, either by increasing the tension in the rods across the servo cams, or, preferably, by lengthening the cam levers slightly for the new servo FD.{Frank Dodd - Bodies}211. (7) There is insufficient travel on the servo cams, and it is impossible to set the servo, with the adjustment provided, so that the servo neither rubs under no load nor do the stops on the ends of the cam levers (the pin heads) touch each other under full load. These stops are a somewhat doubtful advantage (except for setting purposes) in view of the small servo wear and we are going to run S.S.V. in France without them. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||