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).
Table detailing standard engine performance metrics at various RPMs.
| Identifier | ExFiles\Box 133\3\ scan0068 | |
| Date | 6th March 1939 | |
| -8- Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}4/MH.{M. Huckerby}6.3.39. Standard Performance. R.P.M. | BMEP. | LBS/BHP/HR. | IMEP | LBS/IHP/HR. | FUEL INJN. CC/CYCLE. 2000 | 118.0 | .590 | 148.0| .470 | .357 | 102.0 | .455 | 132.0| .352 | .237 | 80.0 | .425 | 110.0| .309 | .174 1800 | 119.0 | .590 | 147.0| .478 | .360 | 107.0 | .435 | 135.0| .345 | .237 | 95.0 | .422 | 123.0| .326 | .205 1600 | 128.0 | .555 | 154.0| .461 | .364 | 110.0 | .417 | 136.0| .337 | .234 | 95.0 | .402 | 121.0| .315 | .196 Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} | ||