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 the ambient temperatures at which a Standard Phantom II Cabriolet will overheat with different ventilation modifications.
| Identifier | ExFiles\Box 92\2\ scan0078 | |
| Date | 25th June 1930 guessed | |
| GRAPH II STANDARD P.II CABRIOLET 19 E.X. AXLE RATIO 14x52 WT. 48 CWT. EMPTY TEMP. AT WHICH CAR WILL OVER-HEAT EVENTUALLY. (100°C - TOP WATER TEMP) TEMP SCALE: 10°C, 20°C, 30°C, 40°C, 50°C STANDARD NO VENTILATION. 35°C. REAR BONNET SHUTTERS OPEN ONLY 37°C. FRONT UNDERSHIELD OFF 38°C FRONT BONNET SHUTTERS OPEN ONLY 38.5°C. FRONT AND REAR BONNET SHUTTERS OPEN 41°C. LOUVRED BONNET. 41.5°C. LOUVRED BONNET. VENTILATED FRONT UNDERSHIELD 43.5°C FOR THIS TEST CAR DRIVEN AT A STEADY 60 M.P.H. ROUND BROOKLANDS TRACK. C.O. CLOSED. DURING TESTS ATS TEMP. AVERAGED ABOUT 21°C. VARYING FROM 17°C TO 24°C. (COMPENSATED FOR ON EACH TEST.) COMPARISON OF VARIOUS ALTERATIONS TO CAR. STANDARD RAD. 6 m/m 7 1/2 m/m TUBES 4.00" DEEP. FRONTAL AREA. | ||