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 comparing air temperature rise during cooling tests with the bonnet on and off.
| Identifier | ExFiles\Box 131\1\ scan0031 | |
| Date | 23th September 1931 | |
| 25EX. COOLING TESTS :- AIR TEMPERATURE RISE ACROSS RADIATOR. AIR TEMPERATURE RISE FROM FRONT OF RADIATOR TO FLOORBOARDS. USING .268" HEXAGONAL MATRIX TUBES. LEFT GRAPH - BONNET OFF (AVERAGE AIR TEMP: 11.5°C) CYLINDER WATER TEMP:- 53.5°C CYLINDER WATER TEMP:- 81.5°C RIGHT GRAPH - BONNET ON (AVERAGE AIR TEMP: 13°C) CYLINDER WATER TEMP:- 64°C CYLINDER WATER TEMP:- 85°C SHADED AREA REPRESENTS AIR TEMP: INCREASE DUE TO EXHAUST AND ENGINE HEAT RADIATION. Y-AXIS: AIR TEMPERATURE INCREASE (°C) X-AXIS: ROAD SPEED (M.P.H) LEGEND: 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: | ||