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).
Dynamo's performance and battery charging requirements under different driving conditions.
| Identifier | ExFiles\Box 36\4\ scan 173 | |
| Date | 25th November 1920 | |
| X30146 Rolls Royce of America Inc. Springfield. Mass. By2/P25.11.20. Attention of Oy. X. 294. DYNAMO. X. 3014b. X. 3878. X. 4030. X. 4162. X. 3231. X. 3564. X. 664. X. 4211. Referring to your memo Oy2/G23.10.20, we fully appreciate the points made in your remarks, but these were carefully weighed up before Mr. Royce's final suggestion was adopted of incorporating in the Instruction Book a note to the effect that the battery could be charged whilst in garage by means of a plug. Whilst agreeing with the general position that American cars, from Ford upwards, can be run under general conditions without having to charge the battery separately. We do not think that this represents the whole position, as this is equally true of small cars in England. The point at issue is that on our own car, the service which the dynamo has to meet is far more exacting than on any small car, since it has to charge and maintain the battery against lighting and starting effects if the car is used all on town work where the speed never exceeds 20 M.P.H. and at the same time it must be equally good in relation to the battery when the car is run in the open or on the Continent, when the engine is doing anything from 2000 to 3000 r.p.m. for long periods, and it is the wide extent that the dynamo is called to cover which causes the difficulty. Contd. | ||