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).
Notes on La Salle engine performance and an analysis of torsional vibrations in Vee 8 and Line 8 crankshafts, noting fractures at high RPM.
| Identifier | ExFiles\Box 173\1\ img421 | |
| Date | 19th February 1934 guessed | |
| 9 partly because it is a side valve engine and again partly because it is using a fixed choke carburetter. La{L. A. Archer} Salle 240 Cu Inch. 6.5-1 C/R.{Sir Henry Royce} R.P.M. 500 1000 1500 2000 2500 3000 3600 B.M.E.P. 97 102 106 109 105 97 84 - TORSIONAL VIBRATIONS Vee 8 & Line 8. - I saw the torsional vibration diagrams of the 8 shaft particulars of which I have given. The 4 per rev was at 3,200 the 8/rev at 1600. I also saw the diagrams of the Vee 8. Curiously enough the 4/rev period on this shaft was little higher than on the line 8 being about 3,300. There was a 3 per rev period, presumably caused by inertia & not explosion, at about 4300 and at this speed they fractured several crank shafts. | ||