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).
Summarizing a test on the Goshawk dynamo brush gear, concluding increased spring pressure leads to excessive wear.
| Identifier | WestWitteringFiles\K\November1923\ Scan62 | |
| Date | 11th November 1923 | |
| ORIGINAL To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. & PN.{Mr Northey} c. HY.{Tom Haldenby - Plant Engineer} EP.{G. Eric Platford - Chief Quality Engineer} DA.{Bernard Day - Chassis Design} EFC1/T21.11.23. X.4383 - GOSHAWK DYNAMO BRUSH GEAR. The Goshawk dynamo brush gear test with the heavier brush spring pressure applied to the new standard brushes and commutator (viz. bevelled brush tops and undercut micas), has now been completed, and attached is my assistant's report on this experiment, from which it will be seen that a slight improvement in brush working surface is obtained, but at the expense of considerably more wear on every brush. It is therefore not thought that the increased spring pressure is a definite advantage. EFC. | ||