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).
Technical memorandum detailing issues with a sequence starter scheme on an EAC.7 chassis and a proposed switch modification.
| Identifier | ExFiles\Box 64\3\ scan0157 | |
| Date | 6th December 1926 | |
| To R.{Sir Henry Royce} from EFC. c. to BJ. Nor. c. to EY. E.{Mr Elliott - Chief Engineer} c. to Dr. x7650a EFC2/T6.12.26. SEQUENCE STARTER. x7600 x7650 Your reference H/M1.9.26. There has been fitted up on one of the new EAC.7 chassis a sequence starter scheme with the 20° spiral with pinion operated switch, without the rubber buffer scheme. On trial of this arrangement we find that with this 20° spiral the motor will not wind the pinion into gear beyond the point where it is assisted by the actuator box. Therefore, if the contact of the pinion operated switch is not made by this time, the apparatus does not function. When we had the larger spiral angle and the motor would, unassisted, wind itself in then it was desirable, in order to avoid thumping, not to make contact until the pinion were nearly home. But it turns out on experiment to be the case also with the 20° angle, as you anticipated for the case of the 5° angle, that it appears correct to revert to the actuator box operated lever switch for which contact is made before the actuator box plunger has completed its travel, i.e. contact must be made before the actuator box ceases to assist the motor in putting the pinion into gear. It is not expedient to re-fit this other type of switch on this chassis, so I have instructed a modification of the present switch by which the same effect is reproduced. There is a small hill on the insulating material, up which the Contd. | ||