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).
Letter to Joseph Lucas Ltd. detailing test results for four R.R.1. type regulators.
| Identifier | ExFiles\Box 166\2\ img235 | |
| Date | 10th January 1939 | |
| EXPERIMENTAL DEPARTMENT. Rm{William Robotham - Chief Engineer}/RC.{R. Childs}10/JH. 10th. January, 1939. Messrs. Joseph Lucas Ltd., Great King Street, BIRMINGHAM. For the attention of Mr. C.E. Robinson. Dear Sirs, We received the four R.R.1. type regulators, which were recently sent to you to be specially adjusted and have now completed our tests on them. In connection with your sheet of test results, EL/CER.W.43.12.38. which accompanied the regulators, we take it that the heading to the third column should read 'Amps at 13.5 through 2 turns' and not 'Amps at 13.5 V through 2 turns'. In testing these four regulators we rigidly followed the procedure suggested in your CER/W.21.12.38. i.e. all observations were made at a dynamo speed of 4,000 r.p.m. and in the case of load tests, the machine was first run up to that speed on open circuit, the circuit then closed and the load gradually increased. This we agree is a simple method, and likely to give the most constant results. Incidentally, we repeated the tests at 3,000 r.p.m. and confirmed that corresponding values were somewhat lower than at 4,000 r.p.m. Attached we give the results of our tests. Ignoring Units Nos. LT.1736 and RR1 III, which are outside the suggested operating range, we find that the two which do come within the suggested voltage range of 16.0 - 16.4 volts are on and above the top limit of our specified output range of 14.5 to 18.5 amperes at 13.5 volts. It would appear then that the correct range of open circuit voltage setting at 4,000 r.p.m. on the R.R. machine to produce our 14.5 to 18.5 amperes at 13.5 Cont'd.{John DeLooze - Company Secretary} | ||