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).
Graph of acceleration curves comparing the Phantom I, Silver Ghost, and 20 HP models.
| Identifier | ExFiles\Box 5a\5\ 05-page199 | |
| Date | 15th August 1928 guessed | |
| ACCELERATION CURVES SPEED M.P.H. TIME TAKEN SECS. Phantom I Silver Ghost 20 H.P. BOTH TOURING CARS ARE STANDARD PHANTOM I. 5 SEATERS 1.87 TONS 20 H.P. | ||