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).
Friction issues with the servo balance lever arm and suggesting oiled cotton duck as a solution.
| Identifier | ExFiles\Box 87\5\ scan0046 | |
| Date | 31th December 1934 | |
| To BY.{R.W. Bailey - Chief Engineer} from HDY.{William Hardy} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Dev. RHC.{R. H. Coverley - Production Engineer} Friction for Servo Balance Lever Arm. With regard to the request in HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KW.17.12.34 for increased area of friction surface to secure more consistent operation, it seems to us that a likely source of variation is that the surfaces become oily in use whereas when erected they are dry. Three dismantled servo arms which we have examined so far have all been oily. We suggest that rather than attempt to keep this joint dry we fit oiled cotton duck which can be attached either to the swinging arm as now or to the bracket on the gearbox, which will give an increase of area and radius of action. In the latter case both halves of the lining should be stapled to the bracket. N. Sch.4314 shows the above suggestion. HDY.{William Hardy} | ||