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 vibrations due to harmonics of gas pressure torque at full throttle for a Standard 20 engine without a damper.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 48 | |
| Date | 10th April 1927 | |
| 8 TORSIONAL VIBRATIONS :- STD 20 R.R. 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 R.P.M. TORSIONAL DEFLECTION AT END OF CRANKSHAFT. DEGREES. 3.0 2.5 2.0 1.5 1.0 .5 0 -.5 -1.0 -1.5 -2.0 -2.5 -3.0 'MASTER' VIBRATION HARMONICS OF 6TH. GAS TORQUE. 18TH. 15TH. 12TH. 9TH. ENGINE R.P.M. 1000 2000 3000 M.P.H. 10 20 30 40 50 60 70 CHL 10/4/27 | ||