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).
Expected performance and efficiency of a dynamo compared to other systems.
| Identifier | WestWitteringFiles\D\March1920\ Scan24 | |
| Date | 1st March 1920 | |
| To CK.{Mr Clark} from R.{Sir Henry Royce} -3- R6/G22/3/20 Contd. We are expecting that the dynamo will cut in at less than 1650 (?1450) revs. (namely, 10 miles per hour) and have sufficient electromotive force to give the full amperes at very little above this speed, and its efficiency and internal losses shall be less than the Smith machine, and the current at the low speeds greater than the Smith machine at equal voltage. We cannot expect to excel in both these directions with less weight than the machines of the self-regulating type, but if we are able to make, say, 10% or 15% improvement in both directions it may be worth while to use this system, especially as a larger current will be available when the batteries are in a low condition of charge. R.{Sir Henry Royce} | ||