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).
Dynamometer graph comparing engine power curves with various silencer configurations.
| Identifier | ExFiles\Box 66\2\ scan0089 | |
| Date | 5th September 1925 | |
| COMPARATIVE SILENCER POWER CURVES (DYNAMOMETER) MODIFIED SILENCER MADE UP AS FOLLOWS:- 63 HOLES .312" DIA IN INTERMEDIATE TUBE ROAD WHEEL B.H.P. ENGINE R.P.M. CUT OUT OPEN. STANDARD SILENCER. MODIFIED STANDARD SILENCER. A.{Mr Adams} CONCENTRIC TUBE SILENCER. B. 46 P.K. 5.9.25. | ||