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).
Electrical system tests for 20 HP and 40/50 HP models, discussing test setup modifications and dynamo output curves.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 16 | |
| Date | 4th December 1926 | |
| Contd. -2- EFCL/T4.12.26. suitable voltmeter, the connections of the test system being in accordance with the technical diagram attached. In the case of the 20 HP. tests, the Mentor and the voltmeter were not included, but the diagram of connections was identical, with the omission of these two units, with the diagram given. Please find attached copies of my assistants' reports PC.118 and PC.119, dealing with the 40/50 tests, also of AC.79 in connection with the 20 HP. tests. In regard to the remarks contained in the report AC.79 relating to the want of flexibility, it was subsequently decided that in actual working on the car this would not be of any material consequence, because the small vibration to which the apparatus is subject and the fact that the dynamo speed would not usually linger at actuating value, would be sufficient to prevent the phenomenon described from taking place. Attached please find two blueprints of curves, one for the 40/50 HP. and one for the 20 HP. in each of which the representative output curve of the dynamo on the chassis at 80°C (as measured in our usual bench manner) is given, together with the output curve at the same temperature, as reduced by the automatic insertion of the resistance incorpor- ated in this unit. It should be specially noted that the effect of using a resistance of the ignition ballast resistance type is to render the reduced output curve more flattened at the moderately | ||