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).
Two graphs comparing the acceleration performance of various vehicle configurations.
| Identifier | ExFiles\Box 178\1\ img213 | |
| Date | 19th November 1926 guessed | |
| ACCELERATION ROLLS ROYCE V BENTLEY VELOCITY M.P.H. TIME SECONDS 6 1/2 LITRE BENTLEY 10 E.X. 15 TOOTH AXLE STANDARD PHANTOM. ALL FIGURES DIRECT DRIVE C.O. CLOSED. ACCELERATION HIGH V LOW AXLE RATIO VELOCITY M.P.H. TIME SECONDS AXLE RATIO 15/52 AXLE RATIO 17/52 PHANTOM HIGH COMPRESSION 5.2/1 NON STREAMLINE BODY | ||