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).
Dynamo temperature testing procedures and specifications, comparing bench tests to on-chassis performance.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan59 | |
| Date | 1st March 1924 | |
| Contd. -2- EFC2/TS.3.24. temperature, measured as described, of a degree or two less than 75°C. The carcase temperature under running conditions on the chassis (machine mounted on engine as in Goshawk and EAC.) has been proved by means of temperature sentinels to have a maximum in the neighbourhood of 85°C, corresponding to the output setting giving 75°C on the bench. On a test of a dynamo of another manufacture, to the specification, it would be assumed that the output setting was arranged to be suitable for operation on the chassis, and the test would be as to whether the dynamo so set would comply with our specification. In the case of a new MR. dynamo, for which we have to give the brush setting, this setting is varied until the dynamo, under the test conditions specified in the general specification, is made just, only, to comply with the clause referring to the limiting temperature at peak output, so there is, for comparison with the curve made from the figures in the general specification, a curve for the actual machine, which corresponds to a temperature of 75°C or thereabouts. In short, the brush setting is done on the limiting temperature at peak output, after which the actual curve is compared with that of the specification. In arranging the specification of production test for each machine, in the first instance, (up-to-date copies of which are also attached, that of the EAC. hs{Lord Ernest Hives - Chair} not being necess- arily final), the figures contained in this test are arranged such that the dynamo as set on the general specification basis will readily comply with those figures. Contd. | ||