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 engine, comparing the crankshaft and camshaft.
| Identifier | ExFiles\Box 124\1\ scan0232 | |
| Date | 9th July 1929 | |
| TORSIONAL VIBRATION TESTS ON B.80 NO.2 B.80 DAMPER + LARGE INERTIA (.0485 SLUG FT^2) SET AT 318 LBS. FT. DEGREES. CRANKSHAFT CAMSHAFT FIG. 3. VIBRATION AMPLITUDE DEGREES ENGINE R.P.M. RM{William Robotham - Chief Engineer}/JRS 9.7.29 | ||