Indicator diagram for a Hispano engine cylinder, plotting pressure against piston displacement for various crank angles.
| Identifier | ExFiles\Box 72\4\ scan0149 | |
| Date | 12th March 1924 guessed | |
| Top Left Box: ONE KLG PLUGS RECORDED ONE PLUG ONLY IS USED Top Right Box: O.2 Spring Used—Rating 91.5 Diagram Area 12.05□ Engine HISPANO Cyl. No. 6 Air Temp. 12°C Bar Temp. 765 m {Mr Moon / Mr Moore} /m Cooling Water Temp. 80°C R.P.M. 1500 Lbs. Lift 137 H.P. 90 I.M.E.P. 138 LBS □ B.M.E.P. 112.0 as/n Max. Expln. Pr. {Percy H. Rose} 465 Av. Expln. Pr. {Percy H. Rose} 448 Mechanical Efficiency 81% Indicated Vol. Efficiency 98% Graph Labels: IGNITION I.C.E.O EC IO ATMOS LINE Left Margin: FULL LINE DOTTED LINE = 91.5 LBS.□" / O.2 LBS / □ Bottom Axis Label: PISTON DISPLACEMENT FOR CRANK ANGLES. | ||
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).