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).
Internal memorandum discussing the design of a dynamo battery system and two-rate charge switching.
| Identifier | ExFiles\Box 163\6\ img109 | |
| Date | 24th December 1930 | |
| To E.{Mr Elliott - Chief Engineer} from EFC. c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. PN.{Mr Northey} Ry. X6016. EFC3/AD24.12.30. X.8780. DYNAMO BATTERY SYSTEM AND TWO RATE CHARGE SWITCHING. X.6016. Your E1/M19.12.30. With your first paragraph we are inclined to agree. There may be another manner, which though less complicated for the chauffeur, might involve four "on" positions on the right-hand side instead of three on each side as proposed. We agree with your summation of the load items and subsequent remarks thereon and therefore we can say that generator output requirements at normal running temperature and above a certain speed are 14 amperes at 14 volts. With regard to your 4th paragraph, it would only be necessary to reduce the dynamo output at the most by a very slight amount, however we are in agreement with the retention of the two-rate charge switching as a useful feature. Our remarks on your 5th 6th and 7th paragraphs are verbally contained in our EFCl/ADl8.12.30 copies of which we addressed to Wor{Arthur Wormald - General Works Manager} and Ry and copies of which we now attach to Sg{Arthur F. Sidgreaves - MD}'s PN{Mr Northey}'s and your copies of this note for their information. We note from your 8th paragraph that you are of the opinion that one resistance only should be utilised. Your 9th paragraph. It would appear that we now might give all output curves at a constant terminal voltage of 14, in which case it would be understood that when the voltage rises as a result of completing the battery charge, the output would be correspondingly greater. The output is also affected considerably by temperature conditions of the machine and I think we had better arrange to shew a set of curves for no resistance and the | ||