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 showing pressure in the Phantom II cooling system against engine RPM under different nozzle and valve conditions.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan049 | |
| Date | 13th January 1930 | |
| PHANTOM II COOLING SYSTEM PRESSURE IN WATER JACKETS AND RUBBER JOINTS DUE TO RESTRICTED DELIVERY NOZZLE AND RESTRICTION VALVE IN TOP WATER PIPE TO LE C. 2675. THE RESTRICTED DELIVERY NOZZLE HAS REDUCED SLOTS .250" WIDE .625" LONG. LEGEND: RESTRICTED DELIVERY NOZZLE RESTRICTION VALVE (LE C 2673) CLOSED RESTRICTION VALVE (LE C 2673) OPEN Y-AXIS: PRESSURE IN WATER SYSTEM (LBS / SQ IN) X-AXIS: ENGINE R.P.M. OTHER TEXT: 2. STAMP: PRINT ROOM, JAN 13 1930, DERBY | ||