Two graphs comparing acceleration performance for different engine compression ratios and car models.
| Identifier | ExFiles\Box 113\2\ scan0122 | |
| Date | 19th November 1926 guessed | |
| ACCELERATION HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. TIME SECONDS 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 1/4 10 E.X. 1.5 CWT LIGHTER THAN STANDARD TOURER. ALSO MORE SPORTING LINES. ALL FIGURES DIRECT DRIVE C.O.CLOSED. ACCELERATION 20 H.P v 40/50 OPEN TOURING CARS STANDARD PHANTOM 2.34 TONS 20 H.P. EMPTY WT. 1.56 TONS. | ||
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).