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).
25 HP engine roughness, detailing tests on a thin flange flywheel and Chrysler balance weights.
| Identifier | ExFiles\Box 137\4\ scan0393 | |
| Date | 5th October 1931 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} 8634 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}6/WJ.5.10.31. 25 HP. ENGINE ROUGHNESS. X.634. X.5300. X.5010. Our tests on the thin flange flywheel have shewn that its effect is to reduce the speed of the vibration from 3100 R.P.M. to 2500 R.P.M., and also greatly to reduce its intensity. We have fitted to this engine the full Chrysler balance weights with a view to reducing their moment until the flywheel vibration can again be felt. With full balance it is absent. Hs{Lord Ernest Hives - Chair}/H.Grylls. | ||