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).
Production test results log for PI type dynamos with 28 slot armatures.
| Identifier | ExFiles\Box 68\4\ scan0063 | |
| Date | 10th April 1929 | |
| X.8672 PRODUCTION TEST. X.8671. R.{Sir Henry Royce} R.{Sir Henry Royce} EAC. DYNAMO X.8781 do. (NARROWER BRUSH MACHINES) WITH 28 SLOT ARMATURES. PI type. | Date. | Dynamo Number. | (1) Remarks. | (2)(3)(4) Remarks. | (5) Output at 1300 r.p.m. Amperes. (12.5 to 13.5). Volts. (18.0±.1) | (6) O.C. Volts. at 590 rpm. (>13.6). | (7)(8)(9)(10) Remarks. | Brush setting angles. | |---|---|---|---|---|---|---|---| | 16-1-29 | R N. 75. | Rect from prodn. Neg rotation. C brush moved in lab. | | 13.0 | 18.0 | 14.2 | 12.5α at 80°C | B = 9.5°, C = 121° | | 16-1-29 | R N. 85. | From prodn. | | 12.8 | 18.0 | 14.7 | 12.4α at 80°C | B = 9°, C = 121° | | 17-1-29 | R N. 95. | From prodn. Comm blackened along edge. | | 12.8 | 18.0 | 13.6 volts at 574 rpm. | 17-56-75, 12.1α at 80°C | B = -, C = 121° | | 17-1-29 | Q O.{Mr Oldham} 15. | Comm blackened on inner side. | | 12.7 | 18.0 | 13.6 volts at 584 rpm. | 18-56-72, 12.2α at 80°C | B = 9.5°, C = 123.5° | | 18-1-29 | Q O.{Mr Oldham} 25. | Comm blackened along edge. | | 13.7 | 18.0 | 13.6 at 585 rpm | 19-58-77 | A = 88°, B = 9.5°, C = 121.5° | | 22-1-29 | Q O.{Mr Oldham} 05. | | | 13.5 | 18.0 | 13.6 volts at 565 rpm | 16.5-57-70.5, 17.3α at 80°C | A = 88°, B = 10°, C = 123° | | 30-1-29 | P P. 95. S28. | Tested by Prodn, checked only in lab. Slight blackening of comm. | | 12.4 | 18.0 | 13.6 volts at 595 rpm | 17-52-69 | B = 7.5°, C = 122.5° | 28 Slot Armatures with Thennier Stampings. | 5-4-29 | Y H.{Arthur M. Hanbury - Head Complaints} 15. S28. | Borrowed from prodn | O.K. | 14.0 | 18.0 | 13.2 volts, 13.6 at 610 rpm | O.K, 16-55-71 | B = 9.5°, C = 121.5° | | 10-4-29 | Y H.{Arthur M. Hanbury - Head Complaints} 35. S28. | Borrowed from prodn | O K | 14.1 | 18.0 | 13.84 | O.K, 18-50-68 | B = 9°, C = 121.5° | | ||