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).
Issues with dampers, including side loads, knocking noises, and potential solutions.
| Identifier | ExFiles\Box 151\2\ scan0375 | |
| Date | 22th December 1938 | |
| -2- RM {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} 1/MH. {M. Huckerby} 22.12.38. Dampers in service have a side load on the arm due to simple wheel bumps. Excessive longitudinal slack in the bearings may cause knocks but this seems rare. Some cars amplify the noise of the knocking damper more than others. This is due to the noise characteristics of the body: about 10. appear to be bad for resonance. We are going to try rubber insulation for dampers to bring all types of body to the same degree of non-sensitivity. A case of damper knock investigated recently was due to loose main fixing bolts. We are informed by the Repair Dept. that this is a common complaint, but is, of course, not due to damper internal design. RM {William Robotham - Chief Engineer} /AFM. {Anthony F. Martindale} | ||