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 tests on a B.80 No. 2 engine with different damper settings.
| Identifier | ExFiles\Box 124\1\ scan0234 | |
| Date | 28th June 1939 | |
| TORSIONAL VIBRATION TESTS ON B.80 NO. 2 B.80 DAMPER (MOMENT OF INERTIA .017 SLUG FT2) 270 LBS. FT. DEGREE. 225 LBS. FT. DEGREE. 204 LBS. FT. DEGREE. VIBRATION AMPLITUDE DEGREES ENGINE R.P.M. FIG 1 RM{William Robotham - Chief Engineer}/JRS. 28.6.39 | ||