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 investigation of commutator and armature issues causing charging failure and clicking noises.
| Identifier | ExFiles\Box 60\1\ Scan253 | |
| Date | 26th August 1930 guessed | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 431-8 12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To............ Order No. PD 54 (3) Customer's No. ..........................19 Commutator; mainly at the positive brushes. These brushes were worn away rapidly until the springs exerted little control over them, when they failed to make proper contact with the commutator and all charging ceased. The clicking noise heard on the car was caused by the two uneven burnt patches on the commutator. This armature was one of the three original 48 coil armatures made in the shop, and one of the two of those armatures, which had the commutator connections lifted and retarded one segment in order to increase the B angle. It is possible, therefore, that the winding was weakened mechanically in the process. There was no evidence that the low output, reported, was due to an alteration in the bedding of the control brushes. Signed C.A.P. This Sheet must be filed on completion of the work. | ||