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 amplitudes for a B60 crankshaft at different RPMs.
| Identifier | ExFiles\Box 132\2\ scan0193 | |
| Date | 26th October 1940 guessed | |
| SHEET 4 B 60 CRANKSHAFT TORSIONALS - The gas torque component of tangential effort is considered with reference to the m.e.p. curve sheet 6. - The calculations are for an undamped crankshaft to RE 869 (2.75" journals, 2" crankpins). FIRING ORDER 1 4 2 6 3 5 Vertical axis (left): 1° alt.on amplitude at the free end the crankshaft. DEGREES. Vertical axis (right): LB/SQ.INCH. maximum stress at the node. Horizontal axis: Crankshaft R.P.M. Graph Peaks: 6, 5 1/2, 4 1/2, 5, 4, 3 1/2 Curve Data 1: 3/REV. MAX. AMPLITUDE @ 5050 RPM = 10.55° Curve Data 2: 2/REV. MAX. AMPLITUDE @ 7575 RPM = 6.95° | ||