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).
Graph plotting engine performance curves showing losses to the exhaust system for a PH. II short type engine.
| Identifier | ExFiles\Box 182\M19\ img273 | |
| Date | 1st November 1931 guessed | |
| RM.{William Robotham - Chief Engineer} P 33 LOSSES TO EXHAUST SYSTEM. PH. II SHORT TYPE. C.O. OPEN AND CLOSED 4.6 C/R 108° MASKED VALVE CAMSHAFT TWIN CARBS 1.4 CHOKES B.H.P B.M.E.P. R P M ① OPEN EXHAUST ② COMPLETE PH II SHORT TYPE EXHAUST SYSTEM C.O. OPEN AXIS VALUES: B.H.P: 80, 90, 100, 110, 120, 130, 140, 150, 160 B.M.E.P.: 60, 70, 80, 90, 100, 110, 120, 130 R P M: 500, 1000, 1500, 2000, 2500, 3000, 3500 | ||