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 analysing power losses in a Phantom II short type silencer exhaust system under various configurations.
| Identifier | WestWitteringFiles\W\September1931-November1931\ Scan067 | |
| Date | 2nd November 1931 guessed | |
| RM.{William Robotham - Chief Engineer} P. 34 LOSSES TO EXHAUST SYSTEM PII. ANALYSIS OF COMPLETE PH.II SHORT TYPE SILENCER 4.6 C/R 108° MASKED VALVE CAMSHAFT TWIN CARBS 1.4 THROATS OPEN EXHAUST ① MAIN EXPANSION BOX REMOVED ② FISH TAIL REMOVED ③ COMPLETE PH.II SHORT TYPE EXHAUST SYSTEM ④ B.H.P. 160 150 140 130 120 110 100 90 80 R.P.M. 500 1000 1500 2000 2500 3000 3500 B.M.E.P. 110 100 90 80 70 60 | ||