Summary of circulation test results for the Phantom II engine, detailing findings from six different data curves.
| Identifier | ExFiles\Box 15\1\ Scan299 | |
| Date | 1st July 1930 | |
| FOR FILES. X7250 Rm. {William Robotham - Chief Engineer} 1.7.30. x766 7250 CIRCULATION FIGURES PHANTOM 11. CURVE 1. - shews 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 temperature we are on the verge of having inadequate circulation. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} | ||
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).