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).
Graph of MPH vs RPM for Standard Top and Overdrive gears, with an axle ratio of 8x34.
| Identifier | ExFiles\Box 147\5\ scan0123 | |
| Date | 11th February 1937 | |
| 36.EX. AXLE RATIO 8x34 OVER-DRIVE STANDARD TOP MPH 120 100 80 60 40 20 0 R.P.M. 1,000 2,000 3,000 4,000 5,000 F.D. 11-2-37. | ||