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).
Faulty dynamos causing excessive sparking on specific chassis models.
| Identifier | ExFiles\Box 168a\3\ img454 | |
| Date | 28th January 1938 | |
| CHILDS S-DR. Rm.{William Robotham - Chief Engineer} RD. 6142. BY/RD.2/B.28.1.38. Faulty Dynamos Ex Chassis 3-BU-32, 3-AX-122, 3-BU-84. The symptoms shown on these dynamos suggest that all have been running in a condition to cause excessive sparking, either by :- (a) Night driving at high speeds, maximum output required from dynamos. or (b) Regulator failure in which the regulator fails to reduce the dynamo output as the battery volts rise. Since the depot did not remove the regulators, we can only assume the cause to be (a), the remedy for which is a dynamo armature which gives a smaller voltage difference between commutator bars. Such an armature is available and has been tested. It will however, be more costly. BY/RD | ||