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 governor characteristics for a Bentley IFI B.III No.2 unit.
| Identifier | ExFiles\Box 168\2\ img017 | |
| Date | 4th February 1938 | |
| To Rm{William Robotham - Chief Engineer}/RC.{R. Childs} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} (6119). Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/WH.4.2.38. BENTLEY IFI. IGNITION CHARACTERISTICS. For B.III No.2 unit the following ignition governor characteristic is required and should be fitted as soon as possible. R.P.M. Advance. Engine Flywheel 250 (125) Start 500 (250) 5° +2° (2 1/2 - 3 1/2) 750 (375) 9° " (4 1/2 - 5 1/2) 1000 (500) 13° " (6 1/2 - 7 1/2) 1500 (750) 18° " (9 - 10) 2000 (1000) 21° " (10 1/2 - 11 1/2) 2500 (1250) 23° " (11 1/2 - 12 1/2) 3000 (1600) 25° " (12 1/2 - 13 1/2) 3500 (1750 boxed) 27° " (13 1/2 - 14 1/2) Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} (Swdl{Len H. Swindell}) (Rm{William Robotham - Chief Engineer} cruay) | ||