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).
Table summarising the results of radiator tests conducted at Brooklands.
| Identifier | ExFiles\Box 94\3\ scan0057 | |
| Date | 19th May 1931 guessed | |
| RESULTS OF RADIATOR TESTS AT BROOKLANDS. Object of Test Conditions of Test Critical Air Temp. °C. Temp. of air leaving rad. core. (Av. air temp. for day 21°C.) Mark V & Mark VI Matrix Comparison (1) Mark VI Matrix, std. fan, "Flip-Flap" Bonnet - flip-flaps open. 40 M.P.H. full throttle 26.5°C. 61.0°C. (2) Mark V Matrix, std. fan, "Flip-Flap" Bonnet, flip-flaps open. 40 M.P.H. full throttle. 20.0°C. 52.5°C. Plain and Louvred bonnet comparisons (3) Standard Mark V Matrix, standard fan, Louvred Bonnet - 40 M.P.H. full throttle 23.0°C. 51.0°C. With (1) speed comparisons. (4) Mark VI Matrix, standard fan, "Flip-Flap" bonnet - flip-flaps open. 30 M.P.H. full throttle. 27.0°C. 63.0°C. (5) Mark VI Matrix, std. fan. As (4) but 50 M.P.H. full throttle. 25.0°C. 58.0°C. Fan Comparisons. (6) As (1) but no fan 20.0°C. 66.0°C. (7) As (1) 26.5°C. 61.0°C. (8) As (1) but .012 blade flexible fan. 24.5°C. 61.0°C. (9) As (1) but .014 blade flexible fan. 24.0°C. 62.0°C. | ||