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).
Goshawk 11 engine vibration issues caused by an unbalanced slipper wheel.
| Identifier | ExFiles\Box 74\3\ scan0254 | |
| Date | 13th February 1922 | |
| X4221 To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Wor.{Arthur Wormald - General Works Manager} Hs{Lord Ernest Hives - Chair}7/LG13.2.22. GOSHAWK 11. ENGINE VIBRATION+ X4221 The investigations carried out in regard to the above to date, confirm that if the slipper wheel is not correctly balanced, it will tend to open out at high speeds. On the two engines which we have broken the Camshaft wheels, the slipper wheels were found to be out-of-balance. On another engine which has been used considerably for Bench Tests and on which we have had no trouble, the wheel is in-balance. Even with the best arrangement of balanced slipper wheel and increased damping friction, the engine will vibrate badly when the valves leave the seats. We are trying to obtain some stronger valve springs so that we can test the engine up to higher speeds. Hs.{Lord Ernest Hives - Chair} | ||