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 the acceleration of various car models and configurations.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 12 | |
| Date | 27th January 1927 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 32 N.K. WT. EMPTY 2.34 TONS COMP. RATIO 4.1/1 10 E.X. 1.5 CWT LIGHTER THAN STANDARD TOURER ALSO MORE SPORTING LINES. 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. Side Text: ALL FIGURES DIRECT DRIVE C.O.C. CLOSED | ||