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).
Table of 3rd gear readings for Autovac tests with a 15/52 axle, showing engine RPM against MPH.
| Identifier | ExFiles\Box 40\4\ Scan056 | |
| Date | 18th April 1923 | |
| X3579 Mr. Hives from GWH.{George W. Hancock - Head Chateauroux} GWH{George W. Hancock - Head Chateauroux}/LG18.4.23. 15/52 AXLE. 3RD. GEAR READINGS FOR AUTOVAC TESTS. Engine r.p.m. M.P.H. 500 9.651 750 14.476 1000 19.302 1250 24.127 1500 28.952 1750 33.778 2000 38.604 2250 43.428 --- ------- | ||