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 specifications and construction of a Lucas motor for the Goshawk II.
| Identifier | WestWitteringFiles\H\January1922\ Scan31 | |
| Date | 3rd January 1922 | |
| To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ & FH. c. Da.{Bernard Day - Chassis Design} & Rg.{Mr Rowledge} c. Ey. & EP.{G. Eric Platford - Chief Quality Engineer} X.4342L - LUCAS MOTOR FOR "GOSHAWK II". This motor has a particularly neat appearance, the carcase being of nickel plate finish, like the Lucas Goshawk dynamo and the C.A.V. machines. The field poles and field coils are well finished off, the field poles being solid and secured to the carcase by two screws. All connections appear to be well carried out. Box type brush holders are fitted with spiral wire spring. The insulation of the brush holders being by means of plates of Continental Bakelite. The brushes are of C.M.3 quality Morganite, each brush having two well insulated pig-tails. Four brushes at 90° are provided. This is necessary in this case as the armature is lap wound. There are a relatively large number of slots (29) and a comparatively small commutator. There are banding wires on the armature. Ball bearings are provided at either end and an oilway is provided at the driving end. The proportions of the armature and carcase are as follows :- Carcase dia. 4.500" " length. 4.350" " thickness. .325" Armature dia. 3.00" " active length 2.60" Weight of complete machine 17.5 lbs. (this includes armature shaft provided by R.R.) Weight of armature, including driving end plate and bearing. 8.3 lbs. contd. | ||