Indicator diagram showing piston displacement for crank angles of a Hispano engine cylinder.
| Identifier | ExFiles\Box 22\1\ Scan140 | |
| Date | 12th March 1924 guessed | |
| 6.2 Spring Used-Rating 91.5 Diagram Area 103 □" 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. 2500 Lbs. Lift 108 H.P. 112.8 I.M.E.P. 118 LBS/□" B.M.E.P. 88.2 LBS/□" Max. Expln. Pr. {Percy H. Rose} 350 Av. Expln. Pr. {Percy H. Rose} 344 Mechanical Efficiency 74.5% Indicated Vol. Efficiency 88% DOTTED LINE SPRING RATING 6.2 LBS/□" FULL LINE 1" = 91.5 LBS/□" DOTTED LINE 1" = 6.2 LBS/□" E.C. T.D.C. IGNITION ATMOS LINE I.C. E.O. 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).