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 a torsional oscillation test on a B.60 engine, comparing different damper configurations and a Standard Wraith.
| Identifier | ExFiles\Box 123\5\ scan0293 | |
| Date | 6th February 1939 guessed | |
| TORSIONAL OSCILLATION TEST ON B.60 B.60 DAMPER SET AT 219 LBS FT/DEGREE B.60 WITHOUT DAMPER STUDEBAKER DAMPER STUDEBAKER DAMPER WITH INCREASED INERTIA. STANDARD WRAITH ENGINE R.P.M AMPLITUDE (DEGREES) RM{William Robotham - Chief Engineer} (582) | ||