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 analyzing power losses in a Phantom II short type silencer exhaust system under various configurations.
| Identifier | ExFiles\Box 6\7\ 07-page172 | |
| Date | 2nd November 1931 guessed | |
| RM{William Robotham - Chief Engineer} P34 LOSSES TO EXHAUST SYSTEM PII. ANALYSIS OF COMPLETE PII SHORT TYPE SILENCER 4 G.C.R. 108° MASKED VALVE CAMSHAFT TWIN CARBS 1.4 THROATS B.H.P R.P.M B.M.E.P ① OPEN EXHAUST ② MAIN EXPANSION BOX REMOVED ③ FISH TAIL REMOVED ④ COMPLETE PII SHORT TYPE EXHAUST SYSTEM | ||