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).
Goshawk III crankshaft torsional vibration diagrams without damper wheels.
| Identifier | ExFiles\Box 25\3\ Scan145 | |
| Date | 18th September 1926 | |
| 1) STANDARD CRANKSHAFT. 3100 R.P.M. STD. PISTONS WITH HEAD (CYL) REMOVED. 3 OSCns PER REV. AMPLITUDE 8 3/4° 2) 12% STIFFER CRANKSHAFT. 3370 R.P.M. DIAGM. WITH ENGINE RUNNING UNDER POWER LIGHT LOAD. AMPLITUDE 6° 3) STD. CRANKSHAFT. 3100 R.P.M. RESULTING VIBRATION UNDER MOTION OF THE THREE REAR PISTONS ONLY. ENG. MOTORED WITHOUT CYL. HEAD. AMPLITUDE 2 3/4° 4) STD. CRANKSHAFT. 1550 R.P.M. FULL LOAD VIBRATION UNDER LOWER HARMONIC OF GAS PRESSURE. WHEN ENG. MOTORED WITHOUT CYL. HEAD THE DIAGRAM BECOMES APPROX. A CIRCLE. 5) 12% STIFFER CRANKSHAFT. 1680 RPM FULL LOAD. NOTE OSCILLATION IS LESS THAN WITH STD. CRANKSHAFT. 6) 12% STIFFER CRANKSHAFT. 1120 R.P.M. FULL LOAD. DIAGMS. 1, 2, & 3 TAKEN WITH SHORT SCRIBER FINDERS | 1.125 & 1.300 RAD. " 4, 5 & 6 " " LONG " " 2.250 & 2.525 RAD. GOSHAWK III CRANKSHAFT TORSIONAL VIBRATION DIAGS. NO DAMPER WHEELS. a.c.l. 18/9/26 | ||