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).
Road performance tests of a concentric tube silencer.
| Identifier | ExFiles\Box 66\2\ scan0078 | |
| Date | 11th September 1925 | |
| R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.B. EXPERIMENTAL REPORT. Expl. No. REF Hs{Lord Ernest Hives - Chair}/AJL/LG11.9.25. CONCENTRIC TUBE SILENCER AS FITTED TO 103-MC. Road performance. The following figures give particulars of the cars' performance with cutout closed and open. Ticknall Hill Test. | | Starting speed. | Finishing speed. | Time taken. | |---|---|---|---| | Cutout closed. | 10 m.p.h. | 53 m.p.h. | 68 secs. | | Cutout Open. | 10 m.p.h. | 55.5 m.p.h. | 65 secs. | Acceleration on level road. | Accelerating from :- | 10 to 30 m.p.h. | 30 to 60 m.p.h. | | |---|---|---|---| | Cutout closed | 10.3 secs. | 25.4 secs. | } time taken | | Cutout open. | 10 secs. | 22.15 secs. | } | It will be seen that the use of the cutout gives relatively little advantage under ordinary touring conditions. Above 60 m.p.h. the cutout open would prove a decided advantage. Hs{Lord Ernest Hives - Chair}/AJL. | ||