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 vibration diagrams for the Wraith III No.1 unit during full throttle tests with a normal damper load.
| Identifier | ExFiles\Box 132\1\ scan0048 | |
| Date | 26th April 1939 | |
| TORSIONAL VIBRATION DIAGRAMS. WRAITH III No 1 UNIT. FULL THROTTLE TESTS WITH NORMAL DAMPER LOAD. 3600 R.P.M. CRANKSHAFT DEFLECTION - 0.167° 3700 R.P.M. CRANKSHAFT DEFLECTION - 0.275° 3800 R.P.M. CRANKSHAFT DEFLECTION - 0.315° 3900 R.P.M. CRANKSHAFT DEFLECTION - 0.343° 4000 R.P.M. CRANKSHAFT DEFLECTION - 0.40° 4100 R.P.M. CRANKSHAFT DEFLECTION - 0.500° 4200 R.P.M. CRANKSHAFT DEFLECTION - 0.625° 4300 R.P.M. CRANKSHAFT DEFLECTION - 0.975° 4400 R.P.M. CRANKSHAFT DEFLECTION - 1.178° G.W. 26.4.39 | ||