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).
Torsional oscillation test results for a B.80 No.3 engine with a 2.75 diameter shaft and no damper.
| Identifier | ExFiles\Box 124\1\ scan0082 | |
| Date | 29th March 1939 | |
| TORSIONAL OSCILLATION TESTS ON B.80 NO. 3 (2.75" DIA SHAFT) NO DAMPER. AMPLITUDE 6.5° 1800 R.P.M. AMPLITUDE 3.5° 3600 R.P.M. FIG 3 T.R.S. 29.3.39 | ||