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).
Tests on a 25 HP engine for roughness, involving a thin flange flywheel and Chrysler balance weights.
| Identifier | Morton\M13.2\ img115 | |
| 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} Ds. c. to By.{R.W. Bailey - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}6/MJ.5.10.31. 25 HP. ENGINE.ROUGHNESS. X.634. X.5300. X.5010. Our tests on the thin flange flywheel have shown 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. | ||