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).
Graph comparing gas velocity past standard and large valves against engine RPM for a 20 HP engine.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 13 | |
| Date | 31th March 1927 | |
| 5 20 H.P. GAS VELOCITY PAST VALVES. INLET AREA PAST VALVES:- STANDARD VALVES = 1.04 SQ. INS. LARGE VALVES (1.400 DIA') = 1.46 SQ. INS. GAS VELOCITY (FT PER SEC) R.P.M. OF ENGINE. STANDARD VALVES. LARGE VALVES. | ||