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).
Technical specifications for the Goshawk electrical system, detailing the dynamo and circuit characteristics.
| Identifier | ExFiles\Box 51\2\ Scan161 | |
| Date | 19th November 1923 | |
| EFC {E. Fowler Clarke - Electrical Engineer} 5/T19.11.23. X.4338 - GOSHAWK ELECTRICAL SYSTEM. This is an earthed system, in accordance with the small photostat diagram attached, all currents return via the chassis frame, except the charging current in passing between the cutout on and the distribution board and the negative terminal of the dynamo. The ammeter indicates definitely the current being taken from, or givento, the battery. Dynamo particulars. Carcase dia. 5.00" " length. 5.00" " thickness .275" Armature dia. 3.10" Active length. 2.75" Weight of complete machine with pulley but without straps 21 lbs. Air gap. .015" Field Circuit. No. of wound poles 4. Dia. of wire. .040" (19 S.W.G.) No. of turns per coil 120. Connection of coils - all in series. Approx. cold (18°C) resistance of field winding 2.6 ohms. Armature Circuit. No. of armature slots 29. No. of armature conductors 464. No. of coils per slot 1. No. of conductors per slot 16. No. of coils or comm. bars. 29. Step or winding pitch in slots 7. (1 to 8) Size of armature wire .040" (19 S.W.G.). Approx. armature resistance cold (18°C) .37 ohms. Contd. | ||