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).
Goshawk dynamo commutation, comparing standard and Morganite brushes on various chassis.
| Identifier | ExFiles\Box 50\5\ Scan289 | |
| Date | 7th March 1924 | |
| X4333 To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. CJ. & PN. {Mr Northey} c. E. {Mr Elliott - Chief Engineer} & Da. {Bernard Day - Chassis Design} c. EY. EP. {G. Eric Platford - Chief Quality Engineer} EFCl/T7.3.24. X.4333 - GOSHAWK DYNAMO COMMUTATION. Further to our various previous experimental reports on Goshawk dynamo commutation, the present report now deals more particularly with observations of results made on several dynamos running on experimental cars. In particular four dynamos were put on expl. chassis 2GII, 4GII, 6GII and 7GII at about the same time. Two of these dynamos had brushes of standard material and two of Morganite material. (In all cases the brushes have bevelled tops according to our present standard practice). Further, one of each material was run on a non-undercut commutator and one of each material was run on an undercut commutator. The arrangement was as follows, the four dynamos being referred to as A, D, 470 and R3:- | | Standard Z Le Carbone brushes. | EG Morganite brushes. | |-----------------|--------------------------------|-----------------------------------| | Not undercut. | on A on 2GII. | on R3 on 7GII. (EG2 brushes) | | Undercut. | on D on 4GII. | on 470 on 6GII. (EGO brushes). | Contd. | ||