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 detailing radiator performance under various conditions using Method 'B'.
| Identifier | ExFiles\Box 24\4\ Scan282 | |
| Date | 21th November 1924 guessed | |
| RADIATOR TESTS - METHOD 'B'. ST Values of δt given are the difference in temp. in Cº between the mean radiator temperatures and atmospheric temperatures necessary for each system to just be able to dissipate at-that-speed the heat given out by its engine at that speed i.e. - the point where the mean radiator temperature will rise no further. CONDITION OF CAR. for various systems. 40/50 HP. 20¼" matrix. | 40/50 H.P. 23¼" matrix | Hispano. No ventilation | 30 m.p.h. | 76.97ºC Fan off sides of bonnet. | " | | 70.17ºC Fan off louvred bonnet. | " | | 71.3ºC | 66.12ºC Louvres open. | " | 69.1ºC | 64.07ºC | 60.7ºC Shutters open. | " | 70.67ºC Top off bonnet. | " | 65.2ºC Sides off bonnet. | " | 62.45ºC | 56.3ºC Side shutters open. | " | 70.67ºC | 65.2ºC Side and top shutters open. | | | 63.3ºC No ventilation. | 20 m.p.h. | | 75.2ºC Louvres | " " | | | 61.2ºC Strong mixture. | 30 m.p.h. | | | 58.0ºC Weak mixture. | " " | | | 63.35ºC Unfortunately, owing to the various types of car bonnets used, and the fact that tests can only be made to find the value of our fan in this way when the bonnet sides are removed, otherwise the car boils, the figures are not so contd :- | ||