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 testing and modification of the Goshawk Dynamo No. A, detailing issues with its commutator and output.
| Identifier | ExFiles\Box 51\1\ Scan055 | |
| Date | 7th March 1922 | |
| X4383 7.3.22. X.4383 - GOSHAWK DYNAMO No. A.{Mr Adams} The first R.R. Goshawk dynamo received in the Expl. Laboratory at the end of January 1922 was fitted with a gunmetal bakelite commutator. A preliminary run proved this combination to be unsatisfactory. The commutator was therefore replaced by one of copper mica, but in replacing, the commutator was inadvertently retarded half a commutator segment. The machine gave an output curve up to specification, but did not commutate well. It was then considered that the commutation was too much retarded, and the commutator connections were changed so as to advance the commutation one segment. On the output test the heating was now excessive and therefore the control brush had to be advanced so that the output curve did not quite meet the specification, although commutation was now fair. We then had slots put in the end plate so that we could retard the whole system of brushes to again increase the output, but this being done we found that the commutator blackened up. Since the above and later, we have made a number of tests to determine the best location of the brushes generally, but owing to insufficiency of slot movement this was abandoned on this machine in favour of carrying it out on the machine No. B in which we are at the moment having very long slots cut. This will remain an expl. machine owing to the improved method of drive on the chassis. | ||