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).
Query to confirm the correct angle for the Phantom servo operating cams, discussing a 55 degree versus a 45 degree angle.
| Identifier | ExFiles\Box 16\3\ Scan027 | |
| Date | 18th December 1928 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from DA.{Bernard Day - Chassis Design} c. to _______ X7370 DA{Bernard Day - Chassis Design}1/M18.12.28. 'SS{S. Smith}' SERVO & BRAKES. X.7370 XJ420 The detail drgs. of the Phantom servo operating cams which we have give a 55° angle. We recollect your speaking of a 45° angle. Would you please confirm which is the angle now used. We have looked through our calculations but as they have been based on a 55° angle in the present Phantom we cannot give any further instructions until we are sure of the actual angle that is used. DA.{Bernard Day - Chassis Design} | ||