Graph comparing the performance and back pressure of five different exhaust systems against engine RPM.
| Identifier | ExFiles\Box 5a\1\ 01-page199 | |
| Date | 11th August 1931 | |
| RM {William Robotham - Chief Engineer} 26 COMPARISON OF EXHAUST SYSTEMS. CHINA(Experimental Engine) 1/2 SHAFT HIGH LIFT ROCKERS 5.65 C/R STD. 15% LARGER CARB. ① OPEN EX. ② P.II EX. SYSTEM ③ W.W. No. 603256 P.II FISHTAIL ④ W.W. No. H. {Arthur M. Hanbury - Head Complaints} 3256 COMP. FISHTAIL ⑤ STD. 25 H.P. SYSTEM ARRGT E. {Mr Elliott - Chief Engineer} 55794 B.H.P. R.P.M. EXHAUST BACK PRESSURE (INS HG) 11-8-31 | ||
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).