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 performance and experimental work of a dynamo unit, including observed defects and noise levels.
| Identifier | WestWitteringFiles\J\January1923\ Scan12 | |
| Date | 3rd January 1923 | |
| Contd. -6- EFC1/T3.1.23. Another intended test, though not yet carried out, will consist of starting with the battery right down and observing the relation of battery charge or discharge current to load on the system with the battery in a thus suitably low condition. The general performance of the dynamo unit has been most satisfactory in every way - no trouble of any description has been experienced. The only defect we have noticed is that the insulating bush in the commutator and cover, passing the wires out from the unit, is loose. All our experimental work has pointed to the conclusion that this unit is capable of supplying to the system an output suitably proportionate to the demand on the system at all times and for all conditions of speed and temperature. Except that, as described above, we think the limits of volt operation might be lessened, so that the current given to a fully charged battery starting cold would more immediately arrive at its proper trickle value. The steadiness of operation is very good. There are slight noises when the cutout and regulator operate, in the nature of a click and a buzz, there being a silent space during the change from one regulating range to another. Also the dynamo itself is a somewhat noisy at one particular slow speed, 1000 R.P.M. No adjustment is provided for the regulator. On examination of the machine the arrangement by which the | ||