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).
The design and material considerations for 40/50 & 20 HP crankshaft friction dampers.
| Identifier | ExFiles\Box 25\3\ Scan300 | |
| Date | 1st January 1928 | |
| HS.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} X634 R2/M1.1.28. c. to BJ. W.OW. BY.{R.W. Bailey - Chief Engineer} OY. X.7770 X.834 X.8010 X.5010 40/50 & 20 HP. CRANKSHAFT FRICTION DAMPERS. Originally these had a dry surface, and seemed to be the easiest thing in the world to get right. Now they seem to require increasingly exact adjustment until Mr. Hives says our latest design cannot be made to give the desired effect. May this be due to the greater perfection in lubrication? If so perhaps some suitable materials can be found, such as thin cork or open woven cotton. Personally you know I never favoured bakelite or ferodo, but wished for something not gummy, and now think it should be porous, so that the oil cannot form a film. Also I suggest we test definitely dry friction surfaces. Thick cork probably would be a failure because it might allow the shaft to move a fraction without actually moving the surfaces. We should also like to know if Mr. Lanchester's hydraulic arrangement is better than lubricated or dry solid friction surfaces. I favour dry friction surfaces. X.7770 Our EAC.7 engine seems to be running quite satisfactorily in every way. I should like to see a power curve of a similar engine compared with the present. Though the body is a large and heavy one the engine seems to have considerably greater of power than usual (i.e. for acceleration, or hills.) R.{Sir Henry Royce} | ||