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).
Severity of engine vibration in 12-cylinder engines.
Identifier | ExFiles\Box 138\1\ scan0039 | |
Date | 24th May 1932 | |
A.{Mr Adams} From Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c. to SG.{Arthur F. Sidgreaves - MD} c. to GR.{George Ratcliffe} c. to WS. c. to RY. X.634. X.4024. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}1/MA.24.5.32. 12 CYLINDER ENGINES. Replying to LS/11.5.32 concerning the severity of the 6th order vibration for a 60 Vee engine, we had not meant to give the impression that the vibration would be bad. As suggested in Hs{Lord Ernest Hives - Chair}/Gr.{George Ratcliffe}3/MA.24.2.32 we think that the amplitude of the 5 per rev vibration for a 12 cylinder 6250 cc engine with a 60 Vee angle will be about 5/6 that of the P.II half period. It should therefore be easy to damp out. Evidence of this is provided by the many 12 cylinder cars on the market on which no period can be felt and which have only medium efficient dampers. HS{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||