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).
Car cooling tests conducted at Brooklands, focusing on ventilation and fan efficiency.
| Identifier | ExFiles\Box 29\3\ Scan127 | |
| Date | 25th September 1924 | |
| R.R. 493a (50x) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LGS. S. 25 BROOKLANDS TESTS. CAR COOLING TESTS. (a) Advantages to be gained from ventilation at high speeds. It was found that opening the four standard bonnet ventilating panels raised the critical temperature of the car by no less than 9°C. Car condition - Top radiator temp. Panels closed. 87°C - 90°C Panels open. 79°C - 80°C AIR TEMP. 26° SUN. 22.5° SHADE (b) Critical ats. temperature for standard car at max. speed on Brooklands. Tests show that the direction of the wind, and the time the track has been exposed to the sun, irrespective of the shade temp. for the day, both have a marked influence on this factor. Under adverse conditions, we find that the EAC. car can be made to over-heat with no ventilation if the air temp. exceeds 26° in the shade. (c) FAN EFFICIENCY AT SPEED. Tests were carried out to determine the value of the fan with its present drive, at max. car speeds. It was found that removing the fan lowered the critical temperature of the car 5°C (approx.) Altering the drive so that the spring was choc-a-bloc and considerable tension exerted on the belt, raised the critical car temp by 4°C (approx.) contd :- | ||