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 increasing damping load on Bentley clutch spring drives and the proposal to run them in on a rig.
| Identifier | ExFiles\Box 85\2\ scan0046 | |
| Date | 1st November 1933 | |
| X212 To RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}16/KT.1.11.33. CLUTCH SPRING DRIVE - BENTLEY. We find that the damping load increases on these spring drives after running in an engine due presumably to the friction surfaces becoming polished and having a higher coefficient of friction. It seems therefore necessary to run in the surfaces in a rig before fitting the spring drive in a car. The damping setting should then remain put. Will you therefore please arrange a rig so that this can be done, so that we can instruct the works to use similar treatment. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||