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).
The comparison of three exhaust systems for the standard 40/50 HP engine.
| Identifier | ExFiles\Box 38\4\ Scan065 | |
| Date | 5th April 1924 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H. D.{John DeLooze - Company Secretary} (1) EXPERIMENTAL REPORT. Expl. No. REF: He/ACL/5.4.24. COMPARISON OF EXHAUST SYSTEMS ON STANDARD 40/50 HP. ENGINE. Tests were made to compare the following three exhaust systems on the standard 40/50 engine - (1) Standard 40/50 system. (2) West WitteringHenry Royce's home town scheme. (3) 'Derby' Scheme. The above systems were used in conjunction with the standard rear silencer and readings taken with cut-out closed and open. The following is the power output given by each of the above three systems taken under the same conditions. contd :- | ||