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 plotting rear axle torque in lbs ft against vehicle speed in M.P.H. for four different gears.
| Identifier | ExFiles\Box 158\2\ scan0046 | |
| Date | 17th May 1939 guessed | |
| 11 REAR AXLE TORQUE IN EACH GEAR TORQUE - LBS FT 1600 1400 1200 1000 800 600 400 200 0 M.P.H. 0 10 20 30 40 50 60 70 80 90 100 1ST GEAR 2ND GEAR DIRECT OVERDRIVE RM{William Robotham - Chief Engineer}/TAS{T. Allan Swinden}/17539 | ||