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).
Test report table showing radiator temperatures under various bonnet ventilation and fan belt conditions.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan019 | |
| Date | 28th February 1921 guessed | |
| STANDARD RADIATOR & 7 1/2 mm. TUBES. | Condition of bonnet ventilation 19-EX. | Std. Fan Belt Solid. All out 80 M.P.H. | Altered Fan Solid. All out 80 M.P.H. | Std. Fan Belt Solid 75 M.P.H. | Std. Fan Belt Solid 50 M.P.H. | |---|---|---|---|---| | Shutters closed. | 88°C. (75°C.) | | 84.5 | 78.5 | | Shutters open. | 80°C. (71.5°C.) | 79°C. (69°C.) | 76° | 73°C. | | Louvred bonnet. | 77 1/2°C. (67°C.) | 75°C. (66.5°C.) | | | Atmospheric temperature 20°C. Figures in brackets, bottom water temperature | ||