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).
Two issues with the Phantom II dynamo output: a drop in amperage and overheating solder.
| Identifier | ExFiles\Box 62\3\ scan0197 | |
| Date | 12th February 1931 | |
| [HANDWRITTEN: X6004] [Text crossed out: c. EFC.] [Text crossed out: c. BY/RD.] BY6/G.12.2.31. [STAMP: RECEIVED 4 FEB 1931] [HANDWRITTEN: HG] X6004 L.H. PHANTOM II - DYNAMO OUTPUT. Referring to Mx{John H Maddocks - Chief Proving Officer}9/T.10.2.31. we note from this, cars suffer from two causes :- 1/- The output after doing a reasonable mileage drops by approximately 1.5 amps. 2/- There are signs of solder being plastic from heat. In regard to (1) :- From our experience we anticipate a difficulty in holding up dynamos to their optimum output in service due to changes occurring in the bedding of the control brush, and should not consider the drop in output you mention unreasonable under the circumstances. In regard to (2) :- We had noticed this also and referred it back to EFC. who considers it is more a question of big output before the dynamo gets hot than a sign of excessive heating after prolonged running and did not consider it a danger. BY [Signature] | ||