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 with different nozzle and valve configurations.
| Identifier | ExFiles\Box 15\1\ Scan203 | |
| Date | 22th 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. PRESSURE IN WATER SYSTEM (LBS/SQ IN) ENGINE R.P.M. LEGEND: RESTRICTED DELIVERY NOZZLE RESTRICTION VALVE (LE C 2673) CLOSED " " " OPEN 2. STAMP: ROLLS-ROYCE JAN 22 1930 DERBY | ||