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).
Summary report on dynamo complaints, failures, noise, and low output for various car models over a six-month period.
| Identifier | ExFiles\Box 130\1\ scan0084 | |
| Date | 30th September 1933 guessed | |
| - 5 - 20 HP. 25 HP. PH.I. PH.II TOTAL. GRAND TOTAL. REMARKS. TOTAL DYNAMO COMPLAINTS. September Quarter. C.C. 3 27 - 5 35) 37 Three rate charge scheme is now standard on 20/25 HP. cars and should reduce dynamo complaints. V.P. 2 2 - - 2) Previous Quarter. C.C. - 20 - 9 30) 33 V.P. - 3 - - 3) Six Months. 4 52 - 14 70 70 DYNAMO FAILURES. September Quarter. C.C. 3 4 - 2 9) 9 Complete failure of dynamos is generally due to some external fault in installation such as open circuit. V.P. - - - - -) Previous Quarter. C.C. - 5 - 4 9) 10 V.P. - 1 - - 1) Six Months. 3 10 - 6 19 19 DYNAMO NOISY. September Quarter. C.C. - 19 - 3 22) 24 These are mainly noisy ball races, due apparently, to lack of lubrication. V.P. - 2 - - 2) Previous Quarter. C.C. 1 8 - 5 14) 16 V.P. - 2 - - 2) Six Months. 1 31 - 8 40 40 DYNAMO LOW OUTPUT. September Quarter. C.C. - 4 - - 4) 4 Dynamos giving better performance at speed are now available for early cars. Lower field resistance also available for later cars with half charge scheme. See Depot Sheet No. 241. V.P. - - - - -) Previous Quarter. C.C. - 7 - - 7) 7 V.P. - - - - -) Six Months. - 11 - - 11 11 | ||