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).
Outlining the two primary causes for faulty dynamos on the Phantom III.
| Identifier | ExFiles\Box 168a\3\ img447 | |
| Date | 17th January 1938 | |
| 6142 RHC{R. H. Coverley - Production Engineer}/Smd.{J. Smedley}1/LS.17.1.38. CHILDS See me R Pin RE FAULTY DYNAMOS - PHANTOM III. With reference to Hd{Mr Hayward/Mr Huddy}/SB.{Mr Bull/Mr Bannister}16/HR.13.1.38, and 3-BU-32, 3-AX-122, 3-BU-84, which have been carefully examined, we find that the solder has become molten at the Commutator Connections, and is undoubtedly due to excessive output. In our opinion this condition is due to one of two reasons as follows :- 1. Faulty regulator, and caused by the contact mechanism sticking and allowing a heavy charge to be passed to the battery. We feel that in these cases it is serious if the Dynamo only is replaced and that the Regulator is not removed, as further trouble is again liable to develop after a small milage. In all cases the Regulator should be removed with the Dynamo and sent for re-inspection. The Regulator manufacturers, Messrs C.A.V. state that occasional failures cannot be prevented. 2. Excessive output due to high speed running with an undercharged battery, or, long distance night driving with innumerable accessories working and causing a large discharge. We do feel that generally it is the voltage control which results in Dynamos being returned in this condition. RHC{R. H. Coverley - Production Engineer}/Smd.{J. Smedley} Smd{J. Smedley} [Handwritten notes in margins] 17/3 31/3 RR Sect 911 15 / 1 470 | ||