Directive to fit radiator louvres and thermometers to all 40/50s and Goshawk cars to maintain high engine temperatures.
| Identifier | ExFiles\Box 38\2\ Scan180 | |
| Date | 1st September 1922 | |
| X.3456. Extract from R3/M1.9.22, X.3614. LOUVRES (RADIATOR) WITH THERMOMETER. X.3456. It is now agreed that the lower grade of petrol demands the engine temperature to be maintained as high as possible and this can best be controlled by louvres in the front of the radiator and a satisfactory thermometer. These should be fitted to all production cars, both 40/50s. and Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))s, in England and America. The 40/50s are to be vertical, and the Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))s are to be horizontal. R. {Sir Henry Royce} | ||
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).