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).
Power curves for a Phantom II Standard Engine, comparing performance with the silencer cut-out open versus shut.
| Identifier | ExFiles\Box 92\2\ scan0122 | |
| Date | 3rd June 1931 | |
| CURVE 2 P.II. POWER CURVES. STANDARD ENGINE. A.{Mr Adams} TWIN CARBS. 1.300" CHOKES. COMPLETE SILENCER. CUT OUT OPEN. B. " " " " CUT OUT SHUT. B.H.P. R.P.M. LWS 3-6-31 | ||