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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
  
  


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