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).
With diagrams explaining a difficulty with the 40/50 HP servo front equaliser shaft and brake leverage.
| Identifier | ExFiles\Box 66\5\ scan0131 | |
| Date | 1st February 1927 | |
| C O P Y. To BY.{R.W. Bailey - Chief Engineer} To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/LG11. 2. 27. 40/50 HP. SERVO. GWH.{George W. Hancock - Head Chateauroux} has pointed out a difficulty on the 40/50 HP. servo with the new front equaliser shaft for the latest front axle. We require friction at q. sufficient to give 25 lbs. load at the end of the swinging link. Assume that in eak sketch 'A' the front and rear brakeg levers are up against their stops and the ropes are just tight. The brakes are applied in sketch 'B' and owing to the difference in leverage, S. moves much further than R.{Sir Henry Royce} and the swinging link operates to counteract thumps. When the brakes are released, however, the swinging link remains stationary and the rear brake pull-off springs rotate the T. lever until the rear levers come up against their stops. contd :- | ||