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 comparing different open touring cars and compression ratios.
| Identifier | ExFiles\Box 178\1\ img214 | |
| Date | 2nd May 1924 guessed | |
| Top Graph: 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 10 E.X. 1.5 CWT LIGHTER THAN STANDARD TOURER ALSO MORE SPORTING LINES. Left side text: ALL FIGURES DIRECT DRIVE C.O. CLOSED Bottom Graph: ACCELERATION 20 H.P v 40/50 VELOCITY M.P.H. TIME SECONDS OPEN TOURING CARS - STANDARD PHANTOM 2.34 TONS. - 20 H.P EMPTY WT. 1.56 TONS. | ||