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 plotting piston displacement against crank angles for different clearances, with a data entry section for engine performance metrics.
| Identifier | WestWitteringFiles\K\September1923\ Scan62 | |
| Date | 17th August 1928 | |
| RR.482A (IH) (BL)ID (17-8-28) MP 2785:5B G.III. Spring Used—Rating Diagram Area Engine Cyl. No. Air. Temp. Bar. Temp. Cooling Water Temp. R.P.M. Lbs. Lift H.P. I.M.E.P. B.M.E.P. Max. Expl. Pr.{Percy H. Rose} Av. Expl. Pr.{Percy H. Rose} Mechanical Efficiency Indicated Vol. Efficiency 1" = 6.2 lbs/□" ATMOS. PR.{Percy H. Rose} LINE .050 CLEARANCE .015 CLEARANCE NO CLEARANCE PISTON DISPLACEMENT FOR CRANK ANGLES | ||