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).
Experiments on a standard engine test plate investigating crankshaft whip and thuds.
| Identifier | ExFiles\Box 25\3\ Scan021 | |
| Date | 20th June 1911 | |
| R.L. 148 (30 H) (W 414 13 4 11) G 1616. Engine Thuds X634 4100/1/2/11 no further expts 1400 Experiments on test plate, standard engine firing on intermediate plugs, clutch was taken out; when firing on No 6 cyl the crankshaft whipped vertically measured with Starrett's Indicator with the clutch ring removed it still whipped, higher compression made it worse. The front end of the crankshaft when firing on No 1 whipped but not as bad as No 6. Worst shuddering speed about 400 revs. EA RP 20/6/11 | ||