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).
Issues with oversized and rigid flexible brush pigtails on E.A.C. dynamos and proposing modifications.
| Identifier | ExFiles\Box 50\5\ Scan307 | |
| Date | 10th April 1924 | |
| X 4333 S E C R E T To BY {R.W. Bailey - Chief Engineer} /RD. from EFC. {E. Fowler Clarke - Electrical Engineer} EFC {E. Fowler Clarke - Electrical Engineer} 1/T10.4.24. X.9670 - E.A.C. DYNAMO BRUSHES. X 4333 X4637 The flexible brush pig-tails on the E.A.C. dynamo brushes are too heavy. They are unnecessarily heavy for the current carrying capacity, particularly as there are twin brushes, but more important than this, they have at present an amount of rigidity causing them to affect the bedding of the brushes. This also applies to the brushes of the E.A.C. type brush gear on the Goshawk machine. On the standard Goshawk brush gear I think you will remember that we specially had the flexibles reduced for this reason, and the same should always apply. It would therefore be desirable to instruct that the flexibles on the brushes we already have be stripped down to a suitable dimension and to instruct the makers to supply smaller flexibles on any further deliveries. Further to this, insulating beads on the new type of brush gear, either E.A.C. or Goshawk, are not required. We mention this because they have been supplied on one or two of the EAC. type Goshawk brushes, and in any case, even if required, should only be of the same size as those on the present standard Goshawk. EFC. {E. Fowler Clarke - Electrical Engineer} | ||