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 comparing torsional vibration test results for a Buick Damper and a B.80 Damper on a B.80 No. 2 engine.
| Identifier | ExFiles\Box 124\1\ scan0226 | |
| Date | 20th July 1939 | |
| TORSIONAL VIBRATION TESTS ON B.80 NO.2. BUICK DAMPER (.00603 SLUG FT² 129 LBS. FT. DEGREE⁻¹) B.80 DAMPER (.0485 SLUG FT² 318 LBS. FT. DEGREE⁻¹) VIBRATION AMPLITUDE DEGREES ENGINE R.P.M FIG. 9 RM{William Robotham - Chief Engineer}/J.R.S. 20·7·39 | ||