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).
Vehicle performance tests conducted at Brooklands, including temperature, hill starts, braking, and steering.
| Identifier | ExFiles\Box 29\3\ Scan129 | |
| Date | 8th July 1925 | |
| R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG8.7.25. (e) Temp. drop across radiator. The average temperature drop across the radiator at maximum speed, car in standard condition with no bonnet ventilation, top radiator temp 80º - 90ºC was found to be 5ºC. (f) Oil temperature to relay. The temperature of the oil to the relay exceeds 90ºC after four or five laps - no ventilation. BROOKLANDS. TEST HILL EXPERIMENTS. (a) Standing starts. 1 in 4 1st. speed accomplished easily. 2nd. speed - failed. 1 in 5 standing start 2nd. speed just accomplished. 1 in 4 portion of hill then just climbed. (b) Braking. It was not possible to stop the car on a gradient of 1 in 5 without the servo assistance. STEERING. At no time during any of the tests was there a sign of high speed steering wobbles. The front tyres were run at 45 lbs. sq.in. pressure. It was necessary to exert considerable strength to hold the car over the bump coming off the banking under the members bridge. contd :- | ||