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).
Series of performance graphs comparing Tractive Resistance, Acceleration, Horsepower and Efficiency for 6 EX and 4 G II models.
| Identifier | ExFiles\Box 113\2\ scan0029 | |
| Date | 26th February 1923 | |
| TOP HEADER: 6 EX OPEN TOURING 16x82. MEDIUM COMPRESSION. WT WITH PASSENGERS 2.15 TONS. ALL READINGS CUT OUT OPEN. 4 G II OPEN TOURING 13.60. WT WITH PASSENGERS 1.625 TONS. GRAPH A (TOP LEFT): Title: TRACTIVE RESISTANCE Y-Axis: TRACTIVE RESISTANCE LBS. PER TON X-Axis: MPH Curves: 4GII CAR & ENG, 6EX CAR & ENG, 4GII CAR, 6EX CAR GRAPH B (TOP MIDDLE): Title: ACCELERATION Y-Axis: ACCN FT. PER SEC. PER SEC. X-Axis: MPH GRAPH C (TOP RIGHT): Title: HP TO ROTATE ENGINE (UNCORRECTED) THROTTLE OPEN Y-Axis: H.P. X-Axis: MPH GRAPH (BELOW A): Title: 4GII & 6 EX CORRECTION FOR ROTATING PARTS FOR GRAPH C (SEE GRAPH D) Y-Axis: HORSE POWER X-Axis: ROAD SPEED MPH Note: 3 OBTAINED FROM (1A-1B)+2A GRAPH (BELOW B, LEFT): Title: ROTATING EFFECT 40/50 WHEELS Y-Axis: H.P. X-Axis: MPH Curves: CLUTCH IN, HP GIVEN OUT DECELERATING CLUTCH OUT, HP ABSORBED ACCELERATING GRAPH (BELOW B, RIGHT): Title: ROTATING EFFECT 40/50 FLYWHEEL Y-Axis: H.P. X-Axis: MPH Curves: HP GIVEN OUT DECELERATING, HP ABSORBED ACCELERATING GRAPH D (MIDDLE RIGHT): Title: HP TO ROTATE ENGINE (THROTTLE OPEN) Note: CORRECTIONS MADE FOR ROTATING PARTS & GEAR LOSSES Y-Axis: H.P. X-Axis: MPH GRAPH E (BOTTOM LEFT): Legend: I.H.P., B.H.P., DYNO H.P. Y-Axis: H.P. X-Axis: R.P.M GRAPH F (BOTTOM MIDDLE): Title: ROAD HP CURVES COMPARED WITH DYNO HP CURVES Curves: DYNO HP, ROAD HP Y-Axis: H.P. X-Axis: M.P.H GRAPH G (BOTTOM RIGHT): Title: MECHANICAL EFFICIENCY ENGINE AND ENGINE & CAR Curves: ME ENGINE, ME ENGINE & CAR Y-Axis: % EFFICIENCY X-Axis: R.P.M BOTTOM NOTE: THICK LINES FOR 6 EX DOTTED LINES FOR 4 G II STAMPS & HANDWRITING: Red Stamp: ROLLS-ROYCE LD LIMITED. PAINT ROOM 29 JAN. 1925 DERBY. Purple Handwriting: ISSUED TO MR. H.J.S. FOR ROAD TEST REPORT 23 JUL 1927 R.W. HARVEY | ||