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).
The performance and failures of various electrical components, detailing a dynamo failure and issues with a diaphragm.
| Identifier | ExFiles\Box 5a\4\ 04-page236 | |
| Date | 27th February 1935 | |
| -9- RE/GSL.10/KM. 27.2.35. on the loose side, and the continual hammering effect of the diaphragms makes it become definitely loose. The paper washer should not be fitted under the spigot. Great care should be taken in rivetting the nut up after tightening, as generally rivetting has flattened out high spots and leaves the unit loose. The pigskin diaphragm on one unit cracked and broke up. A temporary diaphragm had to be fitted. Starter Motor. LdP. DA.{Bernard Day - Chassis Design}427. LdP. DA.{Bernard Day - Chassis Design}266. LdP. DA.{Bernard Day - Chassis Design}432. The starter motor gave no trouble throughout the test. Stop Lamp Switch. This has given no trouble throughout the test. Dynamo Voltage Control. Armature LdP.DE4343. Frame & Field Winding. LdP. D.L2545. The dynamo failed completely at a mileage of 4,000. The armature winding was shorting behind the commutator and a dead short was found on the insulated brush holder. The voltage regulator on this car was apparently a larger type, which allowed a heavier charge from the dynamo. The dynamo heating up first melted the solder out of the commutator segments. This fault caused further heating with the result that the insulation of the armature winding broke down. Main starter Switch. LdP. D.L1690a. Incorporating a coil of finer winding. H.74174. At 2850 miles use of N.Ts. The main starter switch gave no trouble throughout the mileage. | ||