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 Phantom II power curves with open exhaust for three different shaft configurations.
| Identifier | ExFiles\Box 182\M19\ img284 | |
| Date | 7th July 1931 guessed | |
| P.II. POWER CURVES (ALL TAKEN OPEN EXHAUST) A R.{Sir Henry Royce} TYPE 110° SHAFT. TWIN CARBS 1.300 DIA CHOKES. STD. COMP. RATIO B. W.W. " 120° SHAFT. C STD. 116° SHAFT. B.H.P. MEP lbs/sq in | ||