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 graphs comparing engine performance characteristics for high and low compression engines.
| Identifier | ExFiles\Box 19\7\ Scan075 | |
| Date | 5th September 1923 | |
| Graph 1 (Top Left): ENERGY DIAGm. 40-50 R.R. COMPn RATIO 4.4 SEE SHEET 1. Y-Axis: % OF INITIAL PETROL ENERGY. X-Axis: R.P.M Legend: LOSSES THRO' -, COOLING WATER, EXH. GASES, RADIATION, CHARGING WK., INDICATED TH. EFFCY, PISTON POWER, MOTOR FRN, TH. EFFICIENCY. Graph 2 (Middle): 40-50 R.R. POWER & CONSUMPTION WITH HIGH & LOW COMPRESSION ENGINES. SEE SHEETS 1 & 2. Left Y-Axis: B.H.P. Right Y-Axes: PTS/BHP/HR FUEL, FRICTION LOSS IN HORSE POWER X-Axis: R.P.M. Curve Labels: COMP. RATIO 3.9, PETROL CON., COMP RATIO 4.4, B.H.P. HIGH COMP., B.H.P. LOW COMP ENG., COMPRESSION RATIO 3.9, PISTON POWER, FRICTION LOSS. Graph 3 (Top Right): 40-50 R.R. HEAT LOSS TO COOLING WATER WITH HIGH & LOW COMPn ENGINE. IGNITION & MIXTURE NORMAL. HIGH COMPn = 4.4 LOW COMPn = 3.99 SEE SHEETS 3 & 5. Y-Axis: HEAT FLOW TO WATER B.T.H. U's/MIN. X-Axis: B.H.P. Curve Labels: 1/2 LOAD LOW COMP., 1/2 LOAD HIGH COMP., FULL LOAD LOW COMP., FULL LOAD HIGH COMP., HT. FLOW CARBONISED ENGINE R=3.99 FULL LOAD. Graph 4 (Bottom Left): ENERGY DIAGm OF THE 40-50 R.R. COMPn RATIO 3.9. SEE SHEET 2. Y-Axis: % OF INITIAL PETROL ENERGY. X-Axis: R.P.M Legend: LOSSES THRO' -, COOLING WATER, EXH. GASES, RADIATION, CHARGING WK., INDICATED TH. EFFCY, PISTON POWER, MOTOR FRICTION, TH. EFFICIENCY. Graph 5 (Bottom Right): 40-50 R.R. LOW COMP. 3.9 HT LOSS TO CYL. WATER & VARn OF POWER WITH MIX. STRENGTH. SEE SHEET 4 Details: SPEED 500 R.P.M Left Y-Axis: HEAT FLOW TO JACKETS B.T.H. U's / MIN. Right Y-Axis: B.H.P. X-Axis: PETROL PINTS / HOUR Curve Labels: HP FOR VARYING MIX STRENGTHS, HT LOSS TO CYL. JACKETS Annotation: MIX. RANGE ON CARB CONTROL Stamp (Bottom Right): ROLLS-ROYCE LIMITED DERBY Handwritten Note (Bottom Right): A.C.L. 5.9.23 | ||