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 results for a standard radiator comparing performance based on bonnet ventilation, fan type, and speed.
| Identifier | ExFiles\Box 29\3\ Scan269 | |
| Date | 1st September 1930 guessed | |
| STANDARD RADIATOR 6/7 1/4 mm. TUBES. | Condition of bonnet ventilation 19-EX. | Std. Fan Belt Solid. All out 80 M.P.H. | Altered Fan Solid. All out 80 MPH. | Std. Fan Belt Solid 75 MPH. | Std. Fan Belt Solid 60 MPH | |---|---|---|---|---| | Shutters closed. | 88º C. (75º C) | | 84.5 | 78.5 | | Shutters open. | 80º C. (71.8º C.) | 79º C. (69º C.) | 78º | 73º C. | | Louvred bonnet. | 77º C. (67º C.) | 75º C. 151 (66.3º C) | | | Atmospheric temperature 20º C. Figures in brackets, bottom water temperature | ||