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).
Phantom III engine vibrations and the proposed solution of dynamically balancing the flywheel.
| Identifier | ExFiles\Box 91\1\ scan0430 | |
| Date | 12th October 1936 | |
| from MX.{John H Maddocks - Chief Proving Officer} c. Hs{Lord Ernest Hives - Chair}/Ra WYMAN noted Mx{John H Maddocks - Chief Proving Officer}12/T12.10.36 PHANTOM III ENGINE VIBRATIONS. Please refer to Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}7/EW16.5.36 We get about 10% of chassis which show up a bad vibration in the neighbourhood of 2800 engine r.p.m. The vibration is sufficiently marked to agitate the change speed lever, steering column, and set up a boom in the body. In some instances we have effected a marked improvement by lining up the engine to gear box coupling, accurately. We have just had a very bad case on a production chassis where aligning and balancing the clutch and clutch coupling effected no improvement, but we have been able to effect a complete cure by dynamically balancing the flywheel on the lines of Led.5230. In this particular case the amount required to overcome the trouble was 4 ozs/ins. We recommend that provision should be made on production engines to enable the flywheel to be balanced in position. | ||