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 plotting power output and horsepower loss against R.P.M for an E.A.C. engine exhaust system after alterations.
| Identifier | ExFiles\Box 66\2\ scan0024 | |
| Date | 7th February 1925 | |
| E.A.C. ENGINE EXHAUST SYSTEM (EXPER.) POWER OUTPUT OF ENGINE WITH VARIOUS PARTS OF THE EXH. SYSTEM SINCE ALTERATIONS. ALTERATIONS:- THE HOLES IN THE INTERMEDIATE PIPE HAVE BEEN INCREASED IN NUMBER BY 50% (IE INC OF 21 HOLES) THE WIDTH OF NOZZLE ON SWAN NECK HAS BEEN INCREASED TO 9" FROM 6" B.H.P. H.P. LOSS R.P.M. CURVE LABELS: CUT OUT OPEN SILENCER REMOVED & END OF INTERMEDIATE PIPE STOPPED UP SWAN NECK REMOVED COMPLETE SYSTEM CUT OUT CLOSED POWER LOSS WITH CUT OUT CLOSED RELATIVE TO CUT OUT OPEN LOSS TO INTERMEDIATE PIPE LOSS TO SILENCER BAFFLES LOSS TO SWAN NECK. | ||