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).
List of engine speeds where crankshaft vibrations occur on a 2100 series engine without a slipper flywheel.
| Identifier | ExFiles\Box 25\3\ Scan052 | |
| Date | 11th January 1913 | |
| Crankshaft Vibrations. Crankshaft vibrations occur without slipper flywheel at the following speeds on 2100 series engine. - Revs. per minute. 410 485 550 670 750 - ? Crankshaft 830 950 1100 1320 1610 [Handwritten on left margin] Z 634 [Handwritten at bottom] Copied for Engg Dept 11.1.13 WJH | ||