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 tests of a Goshawk Dynamo with a narrow control brush.
| Identifier | WestWitteringFiles\I\July1922\ Scan86 | |
| Date | 13th July 1922 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. to CJ. & FN. c. to Ey. & EP.{G. Eric Platford - Chief Quality Engineer} c. to Rg.{Mr Rowledge} & Da.{Bernard Day - Chassis Design} EFC3/T13.7.22. ORIGINAL X.4383 - GOSHAWK DYNAMO. Though we did not have time before it was necessary to despatch this to R, to make tests of the complete nature that we should like, on this first R.R. Goshawk dynamo with narrow control brush, we found this dynamo to run particularly well and the output to be particularly good within reasonable limits of heating. It was necessary, to keep the heating within such limits, to advance the control brush to its maximum possible extent, after which we found the final carcase temperature, as measured by the thermometer in the usual way, to be 87°C when running on peak of output, the final ambient temperature being 17°C. This was with no end cover on, as is now the standard method. The peak output in this condition was just over 9 amperes at about 1200 r.p.m. The hot balancing point against 13.6 volts we found to be 640 r.p.m. which just complies with our specification. As already reported, this dynamo was fitted with an armature wound in a different manner from standard, with a view to reducing the end connections. This would reduce the armature resistance by an appreciable amount, which reduction is good in every way. EFC. | ||