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 comparing power curves of two Solex carburetter choke sizes against the standard Phantom carburetter.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan110 | |
| Date | 20th January 1929 | |
| POWER CURVES WITH SOLEX TWIN CARBURETTER ON PHANTOM. ONE CHOKE SUPPLIES THREE CYLINDERS 34 M/M CHOKE GIVES 1.055 口'' FREE AREA. 32 M/M '' '' .893 口'' '' B.H.P. ENG. R.P.M. SOLEX 34 M.M. CHOKES SOLEX 32 M.M. CHOKES STD PHANTOM CARB. aey 20/1/29. | ||