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).
Test report detailing the performance, modifications, and failures of various electrical components including a starter motor, switch, dynamo, and battery box.
| Identifier | ExFiles\Box 182\M18\ img063 | |
| Date | 12th April 1941 guessed | |
| -11- The starter motor previously to the 10,000 miles test was taken to the Ice Factory and placed in a freezing chamber for 4 hours, at a temperature 10° below freezing. A bench test was immediately taken and the motor operated first time without hesitation. The starter motor has been on the car for approx. 15,000 miles, and on no occasion has it failed in itself. We had one occasion when it failed to operate, but the fault was traced to a faulty connection on the battery. It was examined at the finish of the previous test of this car, and was found to be in a very good condition. AUTOMATIC SWITCH to LOP.D.71810 - Lec.2804. Modified Teaser Contact. Z. and T. Terminals on Switch short circuited. We have not had or noticed any failings with the above modifications. DYNAMO WITH VOLTAGE REGULATOR. Standard Dynamo converted to Plain Shunt machine, run in conjunction with C.A.V. regulator. Field Coils rewound with 21 S.W.G Wire. Control Brush - deleted. Remaining parts to standard Dynamo D.72906. C.A.V. type B.S. Voltage Regulator and 10 ohm Resistance to Drg. M.29. test. The dynamo had previously ran 7,000 miles, to this test. The dynamo failed to charge after 4,500 miles. The fault was apparently due, in the first place, to a dirty commutator, oil and carbon dust short circuiting the segments of the commutator. This caused heavy sparking to take place and a rough surface developed which caused excessive wear of the carbon brushes. The wear was to such an extent that they became too short and practically no spring loading was left. This caused the several failings reported. We dismantled the dynamo and thoroughly polished the commutator up with very fine glass paper, cleaned out between all the segments, and fitted one pair of new carbon brushes. The dynamo has since not given any further trouble up to the present mileage of 7,000. BATTERY BOX & FITTINGS to LOP.D.73483. Battery Box D.73488. Universal Type National Dagenite Battery 3.B.D. H.L.II.a. (2 - 6.V. units) The connections on the battery became loose at | ||