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).
Comparison table of radiator performance, showing critical overheating temperatures under different conditions.
| Identifier | ExFiles\Box 105\1\ scan0094 | |
| Date | 21th October 1930 guessed | |
| TYPES OF RADIATOR. VERTICAL LOUVRES FULL THROTTLE. 30 M.P.H. 40 M.P.H. NO BONNET VENTILATION 40 M.P.H. All Out 6 mm. Parallel Sq. Tube. E.61385. 30.25 34.0° 42. 33 6/7½ mm. Turbulent Flow Tubes. 26.0 31. 41. 32.25. 6/7½ Standard. 23. 27.25 36. 24.5 Figures given critical atmospheric temperature in °C. at which car will overheat if driven for sufficiently long under the conditions given. | ||