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).
Performance test data sheet for vehicle 39 EX at Brooklands, detailing lap speeds, acceleration, and deceleration times.
| Identifier | ExFiles\Box 155\1\ scan0305 | |
| Date | 26th June 1937 | |
| Rm.{William Robotham - Chief Engineer}. 1320 axles. 300a, 300b, 1062. 26. 6. 37 39 EX AT. BROOKLANDS Lap speed- 1 min 52 secs. - 88.94 m.p.h overdrive " 1 " 50.6. - 90.06 " Half mile - 19.4 secs. - 92.78 m.p.h. overdrive " 19.6 " - 91.81 Air temp. - 16°C. ACCELERATIONS. 10-30. 6.5 secs. 10-40. 9.5 " 10-50. 13.6 " 10-60. 16.8 " 10-70. 22.4 " m.p.h. Decelerations. 90 - 80 - 4.5 secs. 80 - 70 - 6.5 " 70 - 60 - 7.4 " 60 - 50 - 10.4 " 50 - 40 - 15.5 " 40 - 30 - 20.8 " 30 - 20 - 60.0 " | ||