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 showing the results of torsional vibration tests on a B.80 No. 2 damper.
| Identifier | ExFiles\Box 124\1\ scan0233 | |
| Date | 8th July 1939 | |
| TORSIONAL VIBRATION TESTS ON B.80 NO 2 B.80 DAMPER. NORMAL DAMPER INERTIA .017 SLUG FT² 225 LBS. FT² DEGREE⁻¹ NORMAL DAMPER + SMALL INERTIA .0332 SLUG FT² 270 LBS. FT DEGREE⁻¹ NORMAL DAMPER + LARGE INERTIA .0485 SLUG FT² 318 LBS FT DEGREE⁻¹ FIG. 2 VIBRATION AMPLITUDE DEGREES ENGINE R.P.M. RM{William Robotham - Chief Engineer} / JRS | ||