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).
Voltage settings and performance curves at specific speeds.
| Identifier | WestWitteringFiles\B\April1918\ Scan4 | |
| Date | 29th April 1918 guessed | |
| To EFC. from R.{Sir Henry Royce} -4- R3/G17418 Contd. would probably be a curve shewing a maximum at 2500, slightly higher than the 12 volt one. If these speeds are thought too high, then the voltage should not be 20, but something less. R.{Sir Henry Royce} | ||