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).
Ignition advance curves obtained with the oil relay ignition governor.
| Identifier | ExFiles\Box 65\1\ scan0038 | |
| Date | 29th December 1924 | |
| x8685 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rml/LG29.12.24. OIL RELAY IGNITION GOVERNOR. x8685 With reference to the ignition advance curves obtained with the oil relay. We note that LeC.1917 gives two curves of ignition advance - we assume one is to be obtained with the hand control in the fully advanced position, the other with the hand control in the normal advance position. We cannot quite understand how the shape of the ignition curve should alter with the position of the hand control, as long as the battery and magneto are synchronised. Attached is a photostat of the observed ignition advance in these two positions. Is this what you expect? If so, we have misinterpreted LeC.1917. If the curve where the governor runs out at 2000 r.p.m. is correct, we should apparently only get 46° maximum advance? Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||