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).
Suggesting an increase in brush bevel angle from 15° to 45° to address brush noise issues.
| Identifier | ExFiles\Box 60\1\ Scan048 | |
| Date | 16th October 1928 | |
| EFC. X8673 16.10.28. BRUSH CONTROL TESTS. I should like to anticipate the results of the above tests, and suggest that we ask the Le Carbone people to make us up two sets of brushes, in the standard grade material, but with the bevel increased from 15º to 45º. It seems to me that the present bevel of 15º is not sufficient, and even if brushes with an increased bevel do not entirely solve the problem of brush noise, it must be a step in the right direction. C. A.{Mr Adams} P. | ||