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).
Performance graph for the 20/25 HP (China) unit plotting BHP, BMEP and exhaust back pressure against RPM.
| Identifier | ExFiles\Box 104\2\ scan0043 | |
| Date | 8th June 1932 | |
| UNIT C.5 20/25 H.P. (CHINA) UNIT COMP. RATIO 5.7:1 ES7177 (12/29) CAMSHAFT EXHAUST SILENCER:- Z MANIFOLD EXP. BOX (1828) P1 SHORT TYPE SILENCER STANDARD 20/25 SWAN NECK RM{William Robotham - Chief Engineer} 72 C.G. EXHST. BACK PRESS "Hg B.H.P B.M.E.P. R.P.M. OPEN EXHAUST TDC BDC EX IN 5 35 46 6 TAPPETS AT .020 | ||