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 acceleration graphs, one comparing a Rolls Royce Phantom to a Bentley, and the other comparing different axle ratios on a Phantom.
| Identifier | ExFiles\Box 19\7\ Scan091 | |
| Date | 16th 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. 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 | ||