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).
Comparison graph of Indicated Horse Power and Indicated Mean Effective Pressure curves for Lorraine-Dietrich and 20 HP engines.
| Identifier | ExFiles\Box 22\4\ Scan106 | |
| Date | 25th March 1927 | |
| LORRAINE-DIETRICH & 20 H.P. R.R. COMPARISON. INDICATED HORSE POWER & INDICATED MEAN EFFECTIVE PRESSURE CURVES. LEFT Y-AXIS: INDICATED HORSE POWER RIGHT Y-AXIS: INDICATED MEAN EFFECTIVE PRESSURE (LBS PER SQ.") X-AXIS: R.P.M. OF ENGINE. CURVE LABELS: 1. LORRAINE I.H.P. I.M.E.P. 2. 20 H.P. R.R. WITH SAME COMPRESSION RATIO & INDUCTION PIPE DEPRESSION AS THE LORRAINE. (CALCULATED VALUES). I.M.E.P. I.H.P. 3. I.H.P. I.M.E.P. 20 H.P. R.R. WITH SAME COMP. RATIO AS LORRAINE (CALCULATED) 4. STD. 20 H.P. R.R. I.H.P. I.M.E.P. | ||