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).
Power output graph for an X.5BC unit engine, showing performance curves under various test conditions.
| Identifier | ExFiles\Box 90a\2\ Scan101 | |
| Date | 4th June 1934 | |
| FILE REF N° 1 BV41 POWER OUTPUT X.5BC UNIT [REMOVED FROM 35.A.E. (HALL'S) CHASSIS] STANDARD PRODUCTION ENGINE ALL CURVES TAKEN WITH OPEN EXHAUST ① COMPLETE AIR SILENCER FITTED, R.R.X NEEDLES, MIXTURE NORMAL & IGNITION SET 20° B.T.D.C THROUGHOUT TEST. ② AS ① BUT WITH MIXTURE ADJUSTED AT EACH SPEED. ③ AS ② BUT WITH IGNITION ADJUSTED AT EACH SPEED. ④ NO AIR INTAKE, MIXTURE & IGNITION ADJUSTED AT EACH SPEED. B.H.P. B.M.E.P (LB/SQ") R.P.M. VALVE TIMING (.020 CLEARANCE) T.D.C. 1° 11.6° EXH. INL. 55.5° 45.0° R.M. 4/6/34 60 | ||