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 acceleration performance between a Rolls-Royce and a Bentley, and between different axle ratios.
| Identifier | ExFiles\Box 21\2\ Scan035 | |
| Date | 3rd December 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 AXLE RATIO 15/52 AXLE RATIO 17/52 PHANTOM HIGH COMPRESSION 5.2/1 NON STREAMLINE BODY | ||