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).
Test results for crank pins, torsional period, and top gear speed for model 19-EX.
| Identifier | ExFiles\Box 14\2\ Scan095 | |
| Date | 15th January 1931 | |
| FOR FILES. X/1010 19-EX. 15.1.31. , X.7010. X.634. 2.375.dia. crank pins. Top Torsional period 3690 R.P.M. 98.2 M.P.H. Top Gear. Speedometer checked by 2 methods. I.A.Leslie. | ||