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).
Report discussing the testing and advantages of a ballast resistance unit for the ignition system, referencing previous reports on the subject.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 17 | |
| Date | 4th December 1926 | |
| Contd. -3- EFCl/T4.12.26. high speeds than would be the case if a fixed resistance of unalterable value were used. It is a definite advantage to maintain the value of this reduced output at the higher speeds. The ballast resistance actually incorporated on these units is one of double value as is proposed and is being tested out on expl. chassis for standardisation on the ignition system. If the tests on the chassis are satisfactory and shew that this unit is capable of carrying satisfactorily, as we anticipate, this reduced field current, without failure, then the resistance unit for this unit would be eventually precisely the same as for the ignition. May we refer you back to our reports EFCl/T8.10.26 and EFCl/T12.6.26, which contain our observations on the desirability of such a unit. We are of the well considered opinion that a unit of this type is definitely needed for the better functioning of both our chassis electrical systems. There seems no doubt that such a control would save a number of the failures which are inherent in a system which depends for its control upon quite external causes, e.g. the satisfactory connection of the battery. We have in our EFCl/T12.6.26 dealt at some length with these deficiencies. Even in ordinary working with everything correct, and with no failures of the various electro-magnetic units taking place, there is still a good deal of trouble with batteries due to the violent gassing to which they are subject when the demand on the battery is comparatively small. Contd. | ||