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).
Summary of circulation figures for the Phantom II engine, detailing performance under various conditions and tests.
| Identifier | ExFiles\Box 24\5\ Scan248 | |
| Date | 1st July 1930 | |
| FOR FILES. x766. Rm.{William Robotham - Chief Engineer}1.7.30. x766 17250. CIRCULATION FIGURES PHANTOM 11. CURVE 1. - shewes the various errors which are likely to occur if the venturi is incorrectly fitted up. CURVE 11.- shews that at cold water temperatures we have adequate circulation and that two bottom outlets do make an appreciable difference to the circulation. For these temperatures we are well above the minimum circulation at which we start to overheat on the road. CURVE 111 - shews there is little difference between the left-hand and right-hand engine. CURVE 1V. - shews the calibration of the venturi by actual measurement. CURVE V.{VIENNA} - illustrates the fall off in delivery water with inlet/temperature rise. CURVE V1.- shews that at 90°C inlet water temperatur we are on the verge of having inadequate circulation. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||