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).
Benefits and implementation of a dual single pump system over a double pump, particularly concerning the Phantom III model.
| Identifier | ExFiles\Box 149\4\ scan0091 | |
| Date | 4th November 1936 guessed | |
| (sheet 2) It is best to avoid the use of a tap, and to keep both pumps working, in which case there would be no difference between using two single pumps as compared with our present double pump, provided the pumps are wired separately to a switch on the facia board which will give both or either in operation. It will be up to the driver from time to time to test his pumps singly to see that both are in order. We will agree that this scheme is practically what Sales have been asking for. We do not now see any better alternative. In the case of the Phantom III with a reduced output from the G.3. diaphragm, we may be on the edge of starvation in hot weather. It may be argued on this chassis we should stick to the scheme of putting in two double pumps. We would however like to avoid this as it appears to require a somewhat extensive tearup to carry out, and we are hoping that with a little more experience the G.3 will be found to be satisfactory in respect to output, and that we may be able to offer later the larger solenoid and stronger spring. E.{Mr Elliott - Chief Engineer} | ||