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 showing acceleration curves for the Phantom, Silver Ghost, and 20HP open touring cars.
| Identifier | ExFiles\Box 69\4\ scan0387 | |
| Date | 15th August 1928 guessed | |
| ACCELERATION CURVES ROAD SPEED M.P.H. TIME TAKEN SECS PHANTOM SILVER GHOST 20HP OPEN TOURING CARS STANDARD PHANTOM 2.34 TONS 20HP. 1.51 TONS | ||