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).
Polar diagram showing the load on the end journals of a flat 12-cylinder engine at 3500 R.P.M.
| Identifier | ExFiles\Box 115\2\ scan0514 | |
| Date | 16th November 1939 guessed | |
| FLAT 12 CYL. ENGINE - LOAD ON END JOURNALS A-G @ 3500 R.P.M. LBS. DIAGRAMS PLOTTED FOR MAGNITUDE ONLY ON A CRANK ANGLE POLAR DIAGRAM. THE DIAGRAM SHOWN THUS - - - - - IS OBTAINED BY DIVIDING THE FORCES AT THE CYLINDER EQUALLY BETWEEN THE BEARINGS ON EITHER SIDE, THE DIAGRAM SHOWN ____ BEING OBTAINED FOR THE SAME BEARINGS BY USING THE BOWER THEORY. BORE 3½" STROKE 4½" CONN. ROD 4.08 CRANK WT OF PISTON, RINGS, AND PIN 1.61 lbs CONN. ROD WEIGHTS - FORKED | PLAIN LITTLE END 0.8 | 0.75 BIG END 2.0 | 1.27 BEARING DIMENSIONS 2.75" dia x 2.0" FIRING ORDER A 1 4 2 6 3 5 B 2 6 3 5 4 1 30° CRANK ANGLE Nº1 FIRING T.D.C. SHEET 1. | ||