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).
Cooling allowances and a comparative table of maximum speeds and accelerations under various test conditions.
| Identifier | ExFiles\Box 125\3\ scan0128 | |
| Date | 3rd July 1939 | |
| -4- Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}5/JH.3.7.39. Due to lack of test bed data on cooling, only an arbitrary allowance has been made for the effect of temperature on water flow through the pump, the figure selected being a reduction of 2°C in critical air temperature for a rise in top water temperature from 80°C to 100°C. Maximum speeds & Accelerations. Times and max. speeds are as shown in the following table. 7 x 16 6 ply Dunlops front. 7 1/2 x 16 6 ply Dunlops Rear. Car weight empty 41 cwts. 1 qr. Conditions of test. | Lap time. | Lap Speed. | Railway 1/2 mile. Time | Railway 1/2 mile. Speed. | Vickers 1/2 mile. Time | Vickers 1/2 mile. Speed. ---|---|---|---|---|---|--- 30.G.VII. No.2. matrix, Wraith fan. | 1-55 | 86.62 | 20.2 | 89.11 | 19.8 | 90.91. 30.G.VII. No.2 matrix, No fan. | 1-52 | 88.94 | 20.0 | 90.00 | 19.8 | 90.91. Buick. | 1-51.5 | 89.30 | 19.4 | 92.78 | 19.2 | 93.75 30.G.VII. No.1. matrix, short bladed fan. | 1-56 | 85.87 | 20.0 | 90.00 | 19.8 | 90.91. Acceleration figures in direct drive were as over :- | ||