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).
Electrical specification for the 2nd and 3rd Bentley B.III cars, units 4 and 5.
| Identifier | ExFiles\Box 168a\4\ img076 | |
| Date | 9th May 1938 | |
| To HPC. R.C. d' 644. Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester}8/JH.9.5.38. ELECTRICAL SPECIFICATION 2nd. & 3rd. B.III Cars. Units 4 and 5. Herewith a fuller electrical specification for the next two Bentley III chassis. Sec. 7190 Instrument board DCD.612 if available. Sec. 7290 Battery box and fittings. LOP.DB.{Donald Bastow - Suspensions}1573. Sec. 7360 Wiring & Fittings. As Ist. B.III modified. Sec. 8000 Armature starter motor LOP.DW.650 (New issued for B.50). Sec. 8010 Bearing Bkts. etc. LOP.DW.655 (New issued for B.50). Sec. 8020 Commutator LOP.D.55020. Sec. 8030 Frame and field winding LOP.DB.{Donald Bastow - Suspensions}1768 (new issued for B.50). Sec. 8040 Starter drive LOP.DB.{Donald Bastow - Suspensions}1679. Sec. 8060 Starter switch LOP.DW.460 (new issued for B.50). The latest experimental design incorporated in the above starter motor and switch. Simplified brush gear to DCD.157. Oilite bush at commutator end, and simplified core cheeks to R.R. Sch.1073 reduction gear modified for easy broaching. Starter switch to DCD.123 mounted on motor, standard bearings in reduction gear. Simplified drive to DCD.270. Sec. 8050 Horn switch LOP.DW.634. Dynamo Sec. 8020 Armature LOP.DB.{Donald Bastow - Suspensions}1762. " 8080 Bearing Bkt. New " DB.{Donald Bastow - Suspensions}1784 " 8090 Commutator. " DB.{Donald Bastow - Suspensions}1759. " 8100 Frame and field. " DB.{Donald Bastow - Suspensions}1792. Cradle mounted dynamo to DCD.540 with 36 slot armature, would with 2 turns per coil of 19 s.w.g. wire. Bronze brush gear, standard poles and field windings particulars, connections to suit Lucas regulator. The dynamo shaft is lengthened by .200 and the water pump drive shaft correspondingly shortened. | ||