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).
Performance and standardization of an experimental dynamo for the 20/25 HP model.
| Identifier | ExFiles\Box 163\6\ img183 | |
| Date | 4th July 1932 | |
| Y6016 To PN.{Mr Northey} from Ha/Wst. c. BS.{A J. Barnes - Assistant Manager} c. WOR.{Arthur Wormald - General Works Manager} c. E.{Mr Elliott - Chief Engineer} c. EP.{G. Eric Platford - Chief Quality Engineer} Mx.{John H Maddocks - Chief Proving Officer} c. Hd.{Mr Hayward/Mr Huddy} Hs{Lord Ernest Hives - Chair}/Wst.2/MA.4.7.32. DYNAMO CHARGE 20/25 HP. Answering your PNL/VTJ(s).6.32., no improvement has been effected on present production. We have, as you know, made a complete proposal etc. for fitting the 40/50 dynamo with a three charge scheme to the 20/25 and this has been put up to H.{Arthur M. Hanbury - Head Complaints} for his and R's approval. With regard to the experimental 20/25 dynamo we have been testing, we have now had a second armature produced which has been tested and which gives a better cutting in speed than the standard machine, about midway between the standard machine and the 40/50. The out put speed performance, is better than the existing 20/25, and almost equal to the 40/50. In order to improve the cutting in on the 20/25 therefore, E, Ry, and ourselves agree that this dynamo should be standardized on the 20/25 as soon as possible. With the standardization of such a larger output dynamo on the 20/25 it becomes imperative that the daylight charge should be cut down considerably, and we are proceeding immediately with tests in order to ascertain the correct values of field resistances for daylight running. It will then have to be decided whether we adopt the three charge scheme or the present standard two charge scheme with this dynamo on the 20/25. We strongly recommend the former in lieu of a vibrator control as it will not entail much modification to the switchbox and the results, in customers hands, will be much more satisfactory than our existing so called 1 charge scheme. | ||