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).
Record of experiments testing different engine piston weights and flywheel configurations.
| Identifier | ExFiles\Box 25\3\ Scan026 | |
| Date | 23th September 1911 | |
| Nº. Experiment. Result. 10. Fitted with pistons 3 lbs on Tops. Rattles Bad. 12. Fitted with heavy flywheel. Improvement. 13. Fitted with Balance weights. No difference. 14. Fitted with pistons 2 lbs 12ozs. Good just then. 15. Fitted with light flywheel. Bad. Generally - best cure - no pistons and no brake drum. Then heavier flywheel or any lighter pistons, but not only a question of degree. Tested C.P. Taken by Hives 23/9/11. | ||