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 illustrating air temperature rise during cooling tests, comparing results with the bonnet on and off.
| Identifier | ExFiles\Box 16\2\ Scan048 | |
| Date | 23th April 1931 | |
| 25 EX. COOLING TESTS:- AIR TEMPERATURE RISE ACROSS RADIATOR. AIR TEMPERATURE RISE FROM FRONT OF RADIATOR TO FLOORBOARDS. USING .312" HEXAGONAL MATRIX TUBES. BONNET OFF. AVERAGE AIR TEMP: 12.5 °C CYLINDER WATER TEMP:- 57.5 °C CYLINDER WATER TEMP:- 85 °C BONNET ON. AVERAGE AIR TEMP: 13.5 °C CYLINDER WATER TEMP:- 58 °C CYLINDER WATER TEMP:- 85 °C AIR TEMPERATURE INCREASE (°C) ROAD SPEED (M.P.H.) SHADED AREA REPRESENTS AIR TEMP: INCREASE DUE TO EXHAUST AND ENGINE HEAT RADIATION AIR TEMP: RISE ACROSS RADIATOR:- 1) LOW WATER TEMP:- 2) HIGH WATER TEMP:--- AIR TEMP: RISE, FRONT OF RADIATOR TO FLOORBOARDS:- 1) LOW WATER TEMP. 2) HIGH WATER TEMP:- | ||