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).
Outlining two potential methods for fitting a tachometer drive to the B60 engine.
| Identifier | ExFiles\Box 124\1\ scan0264 | |
| Date | 27th November 1939 | |
| To. R.M. TACHOMETER DRIVE ON B60 There was no point in fitting a tachometer because in the early days of the project it was said that the engine would not be run much above 4000 RPM. I see two ways of applying the drive. Ⓐ From the tail end of the dynamo with a reduction box this is not attractive owing to inaccuracies due to belt slip. Ⓑ From the Camshaft by providing a spiral gear somewhere towards the rear of the engine driving a smaller spiral which | ||