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).
Performance and noise characteristics of Dunlop tyres, particularly a low-speed shudder.
| Identifier | ExFiles\Box 45\2\ Scan054 | |
| Date | 2nd January 1928 | |
| S/W. Hs{Lord Ernest Hives - Chair} X4050 Copy to:- H.{Arthur M. Hanbury - Head Complaints} BJ. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} By.{R.W. Bailey - Chief Engineer} Ms. OWB1/GM/2.1.28. RECEIVED Re: DUNLOP TYRES. I have a copy of your report Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LG22.12.27 with regard to the above. I am glad to note that you have been able to convince Messrs. Dunlop that other makers are producing tyres which whilst possessing reasonable qualities in other respects, such as, non skidding, are not as noisy as theirs. It is interesting to note that Messrs. Dunlop have been in the practice of estimating the relative noises of various tyres at a speed of 80 m.p.h. and that, whilst at this speed their own pattern is relatively silent, at lower speeds of 40 m.p.h. other tyres give a better result. Even this latter speed, however, of 40 m.p.h. is not the one at which we find the triple stud tyres, or at all events some of the triple stud tyres, so bad. It is the penetrating groan accompanied by a vibration throughout the whole of the chassis which is sometimes experienced at a speed of 8 to 10 m.p.h. which is even worse feature of these tyres. If run at this low speed the whole chassis shudders and it is usually more noticeable if the car is made to take a slightly sinuous course or on turning a corner, presumably because, in addition to the ordinary rolling and driving stresses some side stress is also imposed on the tyre. The tyres ex Hartridge's car, which you have, are specially notable for this feature and we should be glad if you would demonstrate this particular feature to Messrs. Dunlops also. I think the general effect has been referred to in the past as the "Pomeroy Burton". CWB | ||