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).
Graph showing ignition advance curves against engine RPM.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan033 | |
| Date | 23th April 1926 guessed | |
| contd :- -5- GRAPH 11. GRAPH 11 IGNITION ADVANCE 60 50 40 30 20 10 LAG WITH AWR GOV WTS AND DURALUMIN SMALL RELAY PISTON INITIAL ADVANCE 17 & 8 1/2 ° LIMIT OF ADVANCE FOR MAX POWER ENGINE RPM 500 1000 1500 2000 2500 Hs{Lord Ernest Hives - Chair}/W.A. Robotham. JOHNSON | ||