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).
Page of calculations and instructions regarding servo torque, jaw load, friction, and lever modifications.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan128 | |
| Date | 28th March 1924 guessed | |
| (3) Taking the agreed scheme for instance - 1/2 servo torque = 750 lbs. ins. M.R. of jaws .575 Load on jaws 750 / .550 = 1362 lbs. If the co-efficient of friction between jaws should be .2 (being static friction nearly unlubricated) this would be 272 lbs. off the end pressure. Also the outer bearing will have 470 lbs. radial load = 47 lbs. (with .1 co-efficient) end load. These two together might be 319 lbs. off the end load at the maximum pressure, or 43%. Then if the ferodo co-efficient of friction should be rather less than .350 the actual end load might be half what was anticipated. We have instructed Mr. Hives to increase the levers on N. scheme 1769. and to make the thread 30o, but if the lever is made more than 2.620" long the rod to pedal fouls the change speed shaft. DA.{Bernard Day - Chassis Design} | ||