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).
Graph from the Brooklands tests comparing the critical air temperature versus speed for various engine and cooling configurations.
| Identifier | ExFiles\Box 125\3\ scan0132 | |
| Date | 22th June 1938 guessed | |
| BROOKLANDS TESTS FIG. III COMPARISON OF BUICK, 30.G.VII AND 3.B.50. 30.G.VII - NO. 2 MATRIX - 24.250" x 19.050" x 84 m/m - SHUTTERS FULL OPEN. BUICK - STANDARD 1938 EIGHT CYLINDER. 3.B.50:- STANDARD B50 COOLING WITH 6-CYLINDER I/C ENGINE. CRITICAL AIR TEMP. °C M.P.H. BUICK 30-G-VII - BUICK FAN 3.B.SO - WRAITH FAN | ||