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 sources of noise, such as exhaust or transmission, in relation to testing silent tyres.
| Identifier | ExFiles\Box 157\2\ scan0129 | |
| Date | 16th February 1937 | |
| 1832 Cx.{Major Len W. Cox - Advertising Manager} c. to Hs.{Lord Ernest Hives - Chair} c. to E.{Mr Elliott - Chief Engineer} c. to Sg.{Arthur F. Sidgreaves - MD} c. to O.{Mr Oldham} Rm{William Robotham - Chief Engineer}4/R.16.2.37. Silent Tyres - P.III. Referring to Cx{Major Len W. Cox - Advertising Manager}16/KW15.2.37, the third paragraph of your memo suggests that 3.AZ.22 may be suffering from an exhaust noise, or an over-run groan in the transmission . We have no experience of tyres which are quiet with the clutch disengaged and yet bad for noise when the engine is pulling. However, you should be able to confirm the matter by the test on 3.AZ.38. Our tests round here, which we know can be made to reproduce London conditions fairly closely, indicate that the new trials should be altogether better than the previous pattern. Rm.{William Robotham - Chief Engineer} | ||