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 blueprint graphs comparing acceleration performance of various car models and configurations.
| Identifier | ExFiles\Box 113\2\ scan0117 | |
| Date | 3rd December 1926 guessed | |
| ACCELERATION HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. OPEN TOURING CARS. 10 E.X. Wt EMPTY 2.27 TONS COMP RATIO 5.2/1 98 N.K. Wt. EMPTY 2.34 TONS COMP RATIO 4/1 10 E.X. 1.5 CWT LIGHTER THAN STANDARD TOURER. ALSO MORE SPORTING LINES. TIME SECONDS ALL FIGURES DIRECT DRIVE C.O.CLOSED ACCELERATION 20 H.P. v 40/50 VELOCITY M.P.H. OPEN TOURING CARS. STANDARD PHANTOM 2.34 TONS. 20 H.P. EMPTY WT. 1.56 TONS. TIME SECONDS | ||