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).
Servo efficiency, temperature effects, and the calculation of the coefficient of friction for servo shoes.
| Identifier | Morton\M4.1\ img033 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} -2- EXPERIMENTAL REPORT. Expl. No. 4214 139 REF: Hs{Lord Ernest Hives - Chair}/ACL/LG11. 3.24. The values of μ were calculated taking into account the wrapping action of the two servo shoes, and the average value .36 for μ agrees fairly well with the value given by Ferodo's for the speed of the drum during experiments. The efficiency of the servo decreased as the temperature increased, but no consistent results were obtained. For a constant load on the pedal, the efficiency decreased with the time until a value was reached at which the ratio torque output/torque input remained constant. This was the point at which the temperature remained constant. The efficiency also tended to increase with the speed of rotation of the servo. Hs{Lord Ernest Hives - Chair}/ACL. | ||