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 results of torsional oscillation tests on a B.80 No 3 engine with a 2.75 DIA shaft.
| Identifier | ExFiles\Box 124\1\ scan0080 | |
| Date | 28th March 1939 | |
| TORSIONAL OSCILLATION TESTS ON B.80 NO 3 (2.75 DIA SHAFT) STD. B.80 DAMPER SET 222 LBS FT / DEGREE STD. B.80 WITH DAMPER BEST SETTING (FOR COMPARISON) AMPLITUDE DEGREES ENGINE R.P.M. FIG 1 I.R.S. 28.3.39 | ||