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).
List of critical atmospheric temperatures for various engine and radiator configurations for 20/25 and Bentley models.
| Identifier | ExFiles\Box 105\1\ scan0226 | |
| Date | 23th December 1935 | |
| FILE. X 540 Hs{Lord Ernest Hives - Chair}/Std.15/KW.23.12.35. Critical Atmospheric Temperatures of 20/25 Radiators. 20/25. Critical Air Temp. Present standard engine and radiator 53°C. Large bore engine - present radiator 46°C. Large bore engine - Mark V 58 m.m. radiator 56°C. Bentley. Present standard engine and radiator 48°C. Present standard engine and old Mark III rad. 42°C. Large bore engine and present standard radiator (Mark V). 46.5°C. Large bore engine and Mark VI radiator (52 m.m.) 49°C. Hs{Lord Ernest Hives - Chair}/std. | ||