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).
Calculations for vehicle performance in 2nd gear, including speed, displacement, and ton-miles.
| Identifier | ExFiles\Box 29\3\ Scan012 | |
| Date | 20th March 1911 guessed | |
| T.T. X1010 / 4200. 2nd gear. 27 m per hr. 2.95 miles in 6.5 min.. Ton miles 3.62. = 6620 revs = 802,500 cu ins displacement = 222000 for ton mile = 34200 for ton mile per min. R | ||