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).
Summary table of critical air temperature tests for experimental cars.
| Identifier | ExFiles\Box 131\5\ scan0143 | |
| Date | 7th November 1940 | |
| Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Col. Rm{William Robotham - Chief Engineer}/Col.3/ET.7.11.40. CRITICAL AIR TEMPERATURES OF EXPERIMENTAL CARS. The following tables gives the c.a.t. of several of the Experimental Cars under full throttle maximum speed, and full throttle m/h conditions. No figures are available for 4.B.50; 11.B.V; and 12.B.V; as the standard of cooling on these cars has not been determined: CHASSIS | CRIT:AIR TEMP: F/T. MAX:SPEED. | CRIT:AIR TEMP: F/T 30 M.P.H. ----------------|--------------------------------|------------------------------ 30.G.VII. | 45.0 | 39.5 3.B.50. | 36.5 | 29.5 1-R-1 | 46.5 | ---- | With Mk.VI matrix and thermostatic shutters. 1-R-1 | 40.0 | ---- | With Mk.III matrix and fixed shutters. 8.B.V. | 44.0 | 37.5 | Towing tests at 40 m.p.h. in direct gear. BUICK | 44.0 | 37.0 Rm{William Robotham - Chief Engineer}/Col. | ||