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).
Altitude power curves for a supercharged F.XI engine using 100% benzol and 20/80 benzol/aviation fuel mixtures.
| Identifier | ExFiles\Box 36\2\ scan 147 | |
| Date | 30th January 1928 | |
| R.R. 403 (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. H.I. 1.28 28. COPIES TO: R.CJ. BJ. WOR.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} PN.{Mr Northey} OY. Expl. No. REFs/VH1/LG30.1.28 OBJECT OF TEST. Altitude power curves for super-charged F.XI engine, - on 100% benzol and 20/80 mixture. TESTER. V.{VIENNA} Halliwell. CONDITIONS. Engine RR.F.XI No.25 (.632/1 gear ratio). Supercharger to L.O.P. E.31186. S/C gear ratio 10/1. Compression ratio of engine 6.2/1. Results. A.{Mr Adams} 100% benzol........... 480 HP. maintained up to 10,800ft B. 20/80 benzol/aviation 480 HP. " " " 10,200ft. SUMMARY OF TEST. We give herewith 'Altitude power curves' for the RR. F.XI supercharged engine on 100% benzol and 20/80 benzol/aviation mixture. These curves are comparative with altitude curves previously published for the RR. F.X engine (S/C to E.28403) on 100% benzol. The corrections applied are those given by the A.M. in Addenda A.{Mr Adams} (A.P.940) for mechanically driven supercharger engines - [struck through text] March 1927. Section 2a. Temperature Correction :- Ground H.P. X sqrt((273 + t) / (273 + z)) Where t = observed air temp. z = altitude air temp. Section 2b. Back pressure correction. A correction of plus one per cent for every 40 mm. difference between the atmoshperic pressure at ground level and at the contd:- | ||