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).
Graph comparing Indicated Horse Power and Indicated Mean Effective Pressure curves for a Lorraine-Dietrich and a 20 HP engine.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 125 | |
| Date | 25th March 1927 | |
| LORRAINE-DIETRICH & 20 HP R.R. COMPARISON. INDICATED HORSE POWER & INDICATED MEAN EFFECTIVE PRESSURE CURVES. INDICATED HORSE POWER INDICATED MEAN EFFECTIVE PRESSURE (LBS PER □") R.P.M. OF ENGINE. LORRAINE I.H.P. I.M.E.P. 20 H.P. R.R. WITH SAME COMPRESSION RATIO & INDUCTION PIPE DEPRESSION AS THE LORRAINE. (CALCULATED VALUES) I.M.E.P. I.H.P. I.H.P. I.M.E.P. 20 HP R.R. WITH SAME COMP. RATIO AS LORRAINE (CALCULATED). STD. 20 HP. R.R. I.H.P. I.M.E.P. | ||