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).
Estimated critical atmospheric temperatures for 20/25 and Bentley models with different engine and radiator configurations.
| Identifier | ExFiles\Box 105\1\ scan0236 | |
| Date | 15th January 1936 | |
| x520 FILE: Hs{Lord Ernest Hives - Chair}/Std.6/JH.15.1.36. Estimated Critical Atmospheric Temperatures of 20/25 and Bentley radiators with large and small bore engines. (assuming steam valves set to blow at 2 lbs/sq.in.) (raises B.P. 3.5.°C.) Critical Air Temp. 20/25. Present standard engine and radiator 57°C. Large bore engine & present radiator(84 m.m. Mark III) matrix. 51°C. Large bore engine & 58 m.m. Mark V matrix 56°C. Large bore engine & 52 m.m. Mark VI matrix 60°C. Bentley. Present standard engine and radiator(58 m.m. Mark V) matrix 52°C. Present standard engine and old standard radiator. (Mark III 84 m.m.) 45°C. Large bore engine and present standard radiator. (58 m.m. Mark V matrix) 45°C Large bore engine and present standard size. matrix (476/sq.in.)with 52 m.m. Mark VI matrix. 50°C. Large bore engine and centrally mounted wings and radiator scheme 401/sq.in. matrix in 58 m.m. Mark VI matrix. 54°C. Large bore engine and in 52 m.m. Mark VI block. 40°C. | ||