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).
Selection of an ignition advance curve for the EAC engine's oil relay ignition governor.
| Identifier | ExFiles\Box 65\1\ scan0047 | |
| Date | 31th December 1924 | |
| To Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} c. to CJ. X.8685. S E C R E T E1/M31.12.24. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. OIL RELAY IGNITION GOVERNOR. In reply to your memo. Hs{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}1/LG291224., drawing No. LeC.1917., shews three different ignition advance governor curves of which Mr. Royce chose the one marked in blue colour as the most desirable for the EAC.engine. This curve gives 46° maximum advance with normal advance on the steering column control, and as you remark it does not alter its shape with alteration of the position of this control. The curve will be bodily displaced to give 50° maximum advance when the hand control lever on the steering column is moved to the highest position as indicated on the diagrams of this control given on LeC.1917. E.{Mr Elliott - Chief Engineer} | ||