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).
The disadvantages of an electrical system, comparing it to the existing Goshawk system.
| Identifier | WestWitteringFiles\K\October1923\ Scan79 | |
| Date | 24th October 1923 | |
| Contd. -3- EFC4/T24.10.23. The same can also apply to the body lights, if desired, and as regards its applicability to the horn circuit it seems immaterial to which side of the fuse the current returns. The starter motor relay circuit, if such existed, would go to the frame, so that this circuit in common with the ignition could not be operated after failure of the fuse. The disadvantages of the system would appear to be :- (1) A starter motor with two insulated terminals is required. (2) A position and connections for the earthing of the emergency negative fuse would have to be found. (3) As compared with the insulated system only the failure of this fuse would put out the lights. (Failure of our present Goshawk emergency fuse renders everything dead [handwritten: when car is stopped] and would be very inconvenient at night). The outstanding difference in the system as compared with our present Goshawk is that the emergency fuse is removed from the positive main where it would cause the battery to be disconnected from the system, and put in the negative main where it only causes disconnection of those circuits with the earth return. The system as regards dynamo, starter motor, cutout, inspection and instrument lamps, is an insulated system and these particular connections do not introduce much additional wiring. As regards the remainder of the set, the earthing of these reduces considerably the complication of wiring. A special diagram of connections will shortly be sent, showing the adaptation of the Goshawk units to this system, applicable to E.A.C. II, though units more suited to this case could be designed. EFC. | ||