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).
Comparative table of starter motor particulars.
| Identifier | ExFiles\Box 61b\3\ scan0106 | |
| Date | 17th July 1928 | |
| X523 COMPARATIVE STARTER MOTOR PARTICULARS. Motor | Arm. dia. | Arm. condrs. | Field Turns | Arm. Resis. | Field Resis. | Field turns / arm. conductors. | Field Resis. / arm. resis. ---|---|---|---|---|---|---|--- C.A.V. ZC. | 2.870 | 84 | 6 | .0086 | .0039 | .0715 | .453 Lucas A.510 | 3.575 | 86 | 18 | .0084 | .0028 | .209 | .333 Bosch S.45. | 3.700 | 82 | - | .0095 | .0030 | - | .316 45a. | 3.600 | 90 | 13.5 | .0114 | .0204 | .150 | 1.79 45b. | 3.600 | 90 | 8.75 | .0116 | .0085 | .097 | .732 West'house | 3.250 | 50 | - | .0038 | .0061 | - | 1.60 C.A.V. S.B. | 3.000 | 60 | - | .0060 | .0019 | - | .317 C.A.V. S.C. | 2.746 | - | - | .0125 | .0070 | - | .560 20 HP. | 2.850 | 116 | 5.5 | .0205 | .0064 | .047 | .312 Bosch | 2.750 | 62 | - | .0060 | .0063 | - | 1.05 S.S.1 A2/72 | 3.100 | 82 | 6.5 | .0078 .0078 | .0168 .0132 | .079 | 2.15 1.69 SS.{S. Smith}2A J | 3.100 | 82 | 6.5 | .0080 .0080 | .00365 .015 | .079 | .456 1.875 SS.{S. Smith}2B K | 3.100 2.900 | 90 | 3.5 6.5 | .0138 .0138 | .0038 .021 | .039 .072 | .275 1.52 17.7.28. | ||