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 from cooling tests showing air temperature rise against road speed, comparing results with the bonnet on and off using hexagonal matrix tubes.
| Identifier | ExFiles\Box 182\M19\ img288 | |
| Date | 23th September 1931 guessed | |
| 25EX. COOLING TESTS :- AIR TEMPERATURE RISE ACROSS RADIATOR AIR TEMPERATURE RISE FROM FRONT OF RADIATOR... 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 (A...) CYLINDER WATER TEMP:- CYLINDER WATER TEMP:- SHADED AREA REPRESENTS... DUE TO EXHAUST AND EN... Axis Labels: AIR TEMPERATURE INCREASE (°C) ROAD SPEED (M.P.H) Key: AIR TEMP: RISE ACROSS RADIATOR :- 1) LOW WATER TEMP: AIR TEMP: RISE FRONT OF RADIATOR TO FLOORBOARDS:- 1) LOW WATER TEMP: | ||