Table of acceleration times for various speed ranges, with gear ratio and maximum speed data.
| Identifier | ExFiles\Box 125\3\ scan0129 | |
| Date | 3rd July 1939 | |
| -5- Rm {William Robotham - Chief Engineer} /Ed. {J. L. Edwards} 5/JH.3.7.39. | Speeds. | 10 - 30. | 10 - 40. | 10 - 50. | 10 - 60. | 10 - 70. | 10 - 80. | |---:|---:|---:|---:|---:|---:|---:| | Time. | 7.8 | 10.80 | 14.70 | 18.40 | 24.60 | 33.20 secs. | Gear ratio 9 x 37. 85 m.p.h. at 4000 r.p.m. Road wheel H.P. curve as per Rm {William Robotham - Chief Engineer} /TAS. {T. Allan Swinden} 1/JH.26.6.39. Rm {William Robotham - Chief Engineer} /Ed. {J. L. Edwards} | ||
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).