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 analysing power losses in a Phantom II short type silencer exhaust system.
| Identifier | ExFiles\Box 14\6\ Scan226 | |
| Date | 2nd November 1931 guessed | |
| LOSSES TO EXHAUST SYSTEM P.II. ANALYSIS OF COMPLETE P.II. SHORT TYPE SILENCER 4.6 C/R 108° MASKED VALVE CAMSHAFT TWIN CARBS 1 1/4 DIA THROAT B.H.P. R.P.M. B.M.E.P. ① OPEN EXHAUST ② MANIFOLD AND DOWNTAKE ③ MANIFOLD ONLY ④ MANIFOLD DOWNTAKE AND EXPANSION BOX THE B.H.P. RISES BY 3 WHEN THE INTERMEDIATE PIPE IS ADDED TO CURVE 4. THIS EXPLAINS WHY CURVE 4 IS MUCH THE SAME AS CURVE 2 ON R.M P33 | ||