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).
Potential solutions for 25 HP engine vibrations, such as using counter-weights or a one-piece crankcase and block.
| Identifier | ExFiles\Box 5\6\ 06-page084 | |
| Date | 5th November 1930 | |
| To E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Ra. C. to H.{Arthur M. Hanbury - Head Complaints} Mr. C. to L. Dr. C. to EV.{Ivan Evernden - coachwork} x5300 Hs{Lord Ernest Hives - Chair}/Ra./H/A.H.5.11.30. x.834. x.5300. 25 HP. VIBRATIONS. The difference between a normal crankshaft and a plain bar is so great that we feel that we must again try counter-weights, though previously they have never given us anything. The alternative is to hold the crankshaft free distortion by the C.I. crankcase and block cast in one. This we shall also have on test shortly. It is interesting to have confirmation that the flywheel is at least partially responsible for roughness. Report attached - Hs{Lord Ernest Hives - Chair}/GB.1/W.5.11.30. Hs{Lord Ernest Hives - Chair}/Ra. | ||