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).
Comparison table of gearbox performance data for Mark V, Mark VI, and R.R. project tanks, detailing ratios, acceleration, and speeds.
Identifier | ExFiles\Box 144\4\ scan0186 | |
Date | 10th December 1940 guessed | |
4. Gear, 5th., 4th., 3rd., 2nd., 1st., Rev. Mark V Overall ratio, , 5.55, 10.5, 23.4, 40.8, 33.1 Ratio Gap, , , 0.53, 0.45, 0.57 Tank acceleration, , 0.059, 0.12, 0.25, 0.43, 0.35 Speed at maximum engine r.p.m., , 27.7, 14.6, 6.6, 3.8, 4.6 Mark VI Overall ratio, , 4.26, 8.1, 18.0, 31.3, 26.1 Ratio gap, , , 0.53, 0.45, 0.57 Tank acceleration, , 0.077, 0.15, 0.33, 0.57, 0.47 Speed at maximum engine r.p.m., , 27.0, 14.2, 6.4, 3.7, 4.4 R.R. project Overall ratio, 4.61, 6.59, 9.83, 16.50, 27.65, 27.65 Ratio gap, , 0.70, 0.67, 0.60, 0.60 Tank acceleration, 0.081, 0.116, 0.17, 0.29, 0.49, 0.49 Speed at maximum engine r.p.m., 35.0, 24.5, 16.4, 9.8, 5.8, 5.8 | ||