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).
Performance graph showing ignition advance and detonation for the Wraith III No. 1 unit.
| Identifier | ExFiles\Box 6\6\ 06-page235 | |
| Date | 19th April 1927 | |
| WRAITH III N° I UNIT IGNITION ADVANCE & DETONATION 1) IGN. ADV. MAX POWER 2) TO AVOID DET'N 3) REQUIRED AUTOMATIC LINE CYL HEAD A.F.C.R WITH COMPLETE AIR BEND & SILENCER & COMPLETE STD 25/30 EXH. SILENCER SHELL N° I PETROL R P M I.M.E.P. IGNITION ADVANCE G.T.S. | ||