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 report for higher-output narrow brush dynamos.
| Identifier | ExFiles\Box 68\4\ scan0128 | |
| Date | 20th February 1930 | |
| PI and PII 56 Coil. Higher-Output Machines. (For purposes of forming a specification of test.) PRODUCTION TEST. X.0671. R.R. EAC. DYNAMO X.3781 do. (NARROWER BRUSH MACHINES) | Date. | Dynamo number. | (1) Remarks. | (2)(3)(4) Remarks. | (5)1700 Output at r.p.m. Amperes. (spec 16.0 to 17.0) | (5)1700 Output at r.p.m. Volts. (spec 18.5) | (6) O.C. Volts. Volts (>13.0) at 840 rpm | (7)(8)(9)(10) Remarks. | Brush setting notes. | |---|---|---|---|---|---|---|---|---| | 22-9-28 | H O.1 | Exptl dynamo. First of higher-output machines. | O.K. Run at 1550-1600rpm at 18.7 volts | 16.8 amperes at 1600rpm | 18.7 | 13.6 volts at 765 rpm | O K 17-47-64. | B = 10° C = 127° | | 9-11-28 | 2.NB. HO. | First of higher-output machines received from Production. | O K Run at peak speed 1650rpm at about 18.5 volts. | 16.0 amperes at 1650rpm | 18.5 | 13.6 volts at 830 rpm. | O K 17-60.5-77.5 | B = 8.5° C = 126° | | 15-11-28 | 3.NB. HO. | Recd. from Production. | O.K. Run at peak speed 1820rpm at about 18.6 volts. | 16.4 amperes at 1820rpm | 18.6 | 13.6 volts at 835 rpm. | O.K. 15.5 - 53.5 - 69 | B = 9° C = 125.5° | | 8-12-28 | 4.NB. HO. | Recd. from Production. | O.K. Run at peak speed 1700rpm at 18.5 volts. | 15.9 amperes at 1700rpm | 18.5 | 13.6 volts at 770rpm. | O.K. 16 - 42 - 58 | B = 10° C = 128.5° | | 20-2-30 | 18-HO.SS.{S. Smith} | Recd. from Prod: for the P-of-W's car. First of its type. | O.K. | 16.6 | 18.5 | 14.0 | 16.5 - 40.5 - 57 | B = 8.5° C = 128° C angle afterwards reduced to 127.5° | (Across several columns for the last row) PII Type | ||