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).
Summary of radiator test results conducted at Brooklands.
| Identifier | ExFiles\Box 155\1\ scan0241 | |
| Date | 3rd July 1936 guessed | |
| RESULTS OF RADIATOR TESTS AT BROOKLANDS. | Object of Test | Conditions of Test | Critical Air Temp. | Temp of air leaving radiator core. (Average air. temp. for day = 19°C). | | :--- | :--- | :--- | :--- | | Mark V & Mark VI matrix comparison. | (1) Mark VI Matrix standard fan, flip-flap bonnet - flaps open. 40 M.P.H. full throttle. | 26.5°C. | 61.0°C. | | | (2) Mark V Matrix, standard fan, flip-flap bonnet, flip-flaps open. 40 M.P.H. full throttle. | 20.0°C. | 58.5°C. | | Plain & Louvred bonnet comparisons. | (3) Standard Mark V matrix, standard fan, Louvred Bonnet - 40 M.P.H. full throttle. | 23.0°C. | 61.0°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 standard 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. | | ||