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 the B.III No.2 unit.
| Identifier | ExFiles\Box 168\2\ img022 | |
| 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/MH.{M. Huckerby}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 | 1500 | 25° " | 12 1/2 - 13 1/2 3500 | 1750 | 27° " | 13 1/2 - 14 1/2 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} (Signature: Swdl{Len H. Swindell}) (Signature: Rm{William Robotham - Chief Engineer} anay) | ||