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 report detailing crank pin dimensions, top torsional period, top speed, and speedometer checks.
| Identifier | ExFiles\Box 137\4\ scan0174 | |
| Date | 15th January 1931 | |
| FOR FILES. X 634 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. | ||