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).
Summary of particulars, windings, and brake efficiency test results for various self-starter motors.
| Identifier | ExFiles\Box 61b\3\ scan0036 | |
| Date | 8th April 1918 | |
| R.R. 223a (100 T) (S.H. 159. 11-3-20) G 2860 Handwritten: X523 (crossed out) X6027 To R.{Sir Henry Royce} from EFC. c. to CJ. c. to By.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to By/HBC. EFC5/T8.4.18. X.543. RE SELF STARTER MOTORS X.3247 X.3174. X.2642. X.1248. X.3161. Herewith please receive copy of a summary of particulars of armature and field windings of the various starter motors (allof the four pole, 12 volt type). This summary also includes some other data, e.g., brake efficiency test results. The brake efficiency test results given for all except the R.R.17 slot armature are, we feel, quite reliable, as the experimental conditions prevailing when we took these seemed to be perfectly satisfactory. In the case of the R.R.17 however, there is considerable discrepancy in comparing this with the R.R.45 and R.R.24, whereas one would expect this to lie somewhere in the same region as the other two. Seeing however, that the R.R.17 slot is the least interesting of the three, we have not repeated this test as we have usually done in other cases when there was any uncertainty about the reliability of the experimental results. The brake efficiency test of the Bosch motor is not yet carried out and the small Lucas A.520 motor is not yet to hand. With reference to the C.A.V. self starter motor, it was mentioned in our report upon this that the windingof the armature appeared to consist of two separate and distinct similar windings in parallel with one another, one above the | ||