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).
Performance graph for a supercharged engine (Unit B.12) with a Graham Blower, comparing different rotor types against an unsupercharged configuration.
| Identifier | ExFiles\Box 140\1\ scan0161 | |
| Date | 9th April 1935 | |
| SUPERCHARGED UNIT B.12 PERFORMANCE WITH GRAHAM BLOWER (5.15:1 OVERALL GEAR RATIO) BLOWER IN POSITION 1. WITH SHORT WATER HEATED INDUCTION PIPE. NO HEATING ELSEWHERE. UNSUPERCHARGED CURVE TAKEN WITH STANDARD BENTLEY CAMSHAFT E.B. 1085 & TIMING, STANDARD INDUCTION SYSTEM. CURVES F & H WITH GRAHAM SUPERCHARGER 42 M/M STROMBERG CARB. 20/25 C/S E.59699 TIMED AS UNDER:- I.O 6° E | E.O 53° E I.C 31° L | E.C 3° E F - GRAHAM ROTOR - NO JOINT WASHER IN ROTOR CASING H - R.R. ROTOR UNSUPERCHARGED B.H.P "Hg B.M.E.P RPM Ho. 1909 | ||