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).
Specifications for a Sequence Starter Motor 2B2 Scheme, detailing armature, field, and main windings.
| Identifier | ExFiles\Box 64\2\ scan0151 | |
| Date | 12th April 1928 | |
| X7625B EFC from BY/RD. 12.4.28. SEQUENCE STARTER MOTOR 2B2. SCHEME. K1 Armature Winding. 45 slots. 2 Conductors per slot. Conductor .145 x .045.. Copper strip (.010 rad. in corners). No. of coils = 45. Length of wire per coil = 12.250 inches. Total length in armature = 15½ yards. Total weight of wire (Bare) = 1 lb. 3 ozs. Slot pitch = 1 - 12. Bar pitch = 1 - 24. No. of comm. bars = 45. Field Winding. Teazer winding.= 36 turns per coil of 17 S.W.G. (.056 dia) D.C.C. copper wire. Length of wire per coil = 28 ft. Main Winding. 3½ turns per coil of copper wire .156 x .156 (.025 radius in corners) Length of No.1,2 and 3 coils = 31.000 " " No.4 Coil = 32.000 BY/RD. | ||