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).
Continued discussion on battery performance in cold weather and the need for a more powerful starting motor for use in the United States.
| Identifier | ExFiles\Box 61b\3\ scan0066 | |
| Date | 3rd June 1920 | |
| Contd. -2- Oy - 5 G 3.6.20. X.540. -6027. battery for cars here where the internal battery position is called for. We would also like from Mr. Day, an arrangement if it exists showing what internal arrangement has been standardised by Derby. X.3778. We shall be particularly interested in the result of your temperature tests on batteries, since we have received information here to the effect that at ten below zero, or some such figure, the capacity of a battery is reduced fifty percent and the internal resistance largely increased, which militates seriously against starting in the wintertime. We should recommend, therefore, that, to help us, your tests on batteries should be carried to temperatures of at least ten below zero, representing possible actual running conditions in this country. From consideration of the reduced capacity of the smaller Chloride battery, it appears to us that for the United States at least it will be necessary to use the larger batteries because of the winter driving conditions. X.1058. X.543. I have already proposed to Derby that we really need the additional horsepower given by the Bijur starting motor rather than our own, their horsepower being nearly double for a given speed. This, we believe, is necessary to turn the engine over fast enough to start it in wintertime in this country without resort to the priming device, or in cases where | ||