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).
Comparison of fitting a 40/50 dynamo versus a new 20/25 machine with different battery charging schemes.
| Identifier | ExFiles\Box 163\6\ img191 | |
| Date | 8th July 1932 | |
| -2- Hs{Lord Ernest Hives - Chair}/Wst.9/MA.8.7.32.Contd. (a) To fit the 40/50 dynamo to the 20/25 with a 3 charge scheme which will give us one advantage namely better cutting in(16 M.P.H. under worst Summer running conditions). (b) To fit the new 20/25 machine with either a two or three charge scheme. The two charge scheme will give us about the same cutting in under worst conditions as (a) but will tend to overcharge the battery in the summer time. The three charge scheme safeguards the battery and gives a poor cutting in point under the worst Summer running conditions. (19 M.P.H.) Curves attached herewith. Hs{Lord Ernest Hives - Chair}/Wst. | ||