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).
Diagram showing the amplitude of torsional vibration oscillation on a Std 20 RR engine without a damper.
| Identifier | ExFiles\Box 140\3\ scan0135 | |
| Date | 10th April 1927 | |
| TORSIONAL VIBRATIONS - STD 20 RR WITHOUT DAMPER. DIAGRAM SHEWING AMPLITUDE OF OSCILLATION DUE TO HARMONICS OF GAS PRESSURE TORQUE AT FULL THROTTLE. THE STD DAMPER DEALS EFFECTIVELY WITH THESE EXCEPT THE OSCILLATION AT 3300 RPM. TORSIONAL DEFLECTION AT END OF CRANKSHAFT DEGREES. MASTER VIBRATION. HARMONICS OF 6TH GAS TORQUE. ENGINE RPM. MPH. 18TH. 15TH. 12TH. 9TH. ack. | ||