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 M.E.P. (Mean Effective Pressure) and Torque values.
| Identifier | ExFiles\Box 181\M7\ img065 | |
| Date | 28th May 1928 guessed | |
| 100. 300 90. 270 80. 240 70. 210 & M.E.P. (LBS. PER SQ. INCH.) 60. 180 FT LBS: | ||