Graph comparing the acceleration performance of a Phantom (12EX) with a Solex and an RR carburetter.
| Identifier | ExFiles\Box 121\2\ scan0100 | |
| Date | 5th February 1929 | |
| CAR SPEED (M.P.H.) TIME (SECS) PHANTOM ACCELERATION (12EX) SOLEX AND RR CARBURETTER SOLEX R.R. 5-2-29 | ||
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).