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 of torsional vibration analysis for a B60 crankshaft against RPM.
| Identifier | ExFiles\Box 132\2\ scan0192 | |
| Date | 26th October 1940 guessed | |
| SHEET 3 B 60 CRANKSHAFT TORSIONALS. The gas torque component of tangential effort is supposed due to a constant m.e.p. of 120 lb/sq.in The calculations are for an undamped crankshaft to RE 869 (2.75" journals, 2" crankpins). FIRING ORDER 1 4 2 6 3 5 Y-Axis Left: Vibration amplitude at the free end of the crankshaft. ± DEGREES. Y-Axis Right: LB/SQ. INCH. Maximum stress at the node. X-Axis: Crankshaft R.P.M. Peaks labelled: 6, 5½, 5, 4½, 4, 3½, 2½ 3 / REV MAX. AMPLITUDE @ 5050 RPM = 9.75° 2 / REV MAX. AMPLITUDE @ 7575 RPM = 6.75° | ||