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).
Material selection for the worm wheel in the Servo Motor Mechanism P.D.138.
| Identifier | ExFiles\Box 95\4\ scan0156 | |
| Date | 6th April 1938 | |
| 341. To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. By/CRL.{C. R. Lisson} Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}2/AP.6.4.38 SERVO MOTOR MECHANISM P.D.138 When this servo is detailed and instructed may we have the first worm wheel made of duralumin. If a second worm wheel was instructed in bronze, to be used as a spare, then the car would not be held up for long if the aluminium wheel failed. The load on this wheel has been reduced by 35% compared to Wraith. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||