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 torsional vibration tests on a B.80 No.2 engine, using a Studebaker damper with increased inertia and different rubber hardnesses.
| Identifier | ExFiles\Box 124\1\ scan0229 | |
| Date | 22th June 1934 | |
| TORSIONAL VIBRATION TESTS ON B.80 NO.2 STUDEBAKER DAMPER WITH INCREASED INERTIA (.0246 SLUG FT²) 75 - 80 RUBBERS 55 - 60 RUBBERS 35 - 40 RUBBERS VIBRATION AMPLITUDE DEGREES. ENGINE R.P.M. FIG. 6 R.M. / J.R.S. 22.6.34. | ||