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 plotting amplitude against engine RPM for torsional oscillation tests on a B.80 No 3 engine.
| Identifier | ExFiles\Box 132\1\ scan0133 | |
| Date | 28th March 1939 | |
| TORSIONAL OSCILLATION TESTS ON B.80 No 3 (2.75 DIA SHAFT) ----- STD. B.80 DAMPER SET 222 LBS FT / DEGREE ____ STD. B.80 WITH DAMPER BEST SETTING (FOR COMPARISON) AMPLITUDE DEGREES ENGINE R.P.M. FIG. 1 I.R.S. 28-3-39 | ||