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 of overheating test results for a Standard PII Cabriolet with different ventilation modifications.
| Identifier | ExFiles\Box 19\4\ Scan081 | |
| Date | 2nd July 1930 guessed | |
| GRAPH II. STANDARD PII CABRIOLET 19 E.X. AXLE RATIO 14x52 WT. 48 CWT. EMPTY. TEMP. AT WHICH CAR WILL OVER-HEAT EVENTUALLY. (100°C - TOP WATER TEMP.) Scale: 0°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. | ||