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).
Squeal tests for different types of Avon tyres.
| Identifier | ExFiles\Box 156\3\ scan0267 | |
| Date | 1st August 1941 | |
| 1331 To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}24/ET.91/1.8.41. AVON TYRES. Herewith report on special tyres supplied by Avon India Rubber Co. None of these series of tyres are as good for squeal as the previous set of special tyres Nos. KR.6024, KR.6043, KR.6360, KR.6381 - BKB - EPR.93. On one particular test route the above tyres squeal at 18-19 M.P.H., but the 4 new sets squeal at 15-17 M.P.H. Herewith table:- SQUEAL STANDARD - LC.7466 - LC.7404 - LD.1978 - LD.1979 - 15-16 M.P.H. STANDARD WITH CORNERS ROUNDED - LC.6455 - LC.5942 - LC.6443 - LC.5906 - 16-17 M.P.H. LOW CROWN ANGLE - LD.2058 - LD.3503 - LC.5966 - LC.8091 - 15-16 M.P.H. HIGH " " - LD.4742 - LD.3724 - LD.1293 - LC.7904 - 15-16 M.P.H. Pressures used for all tests:- Front 25 lbs. - Rear 28 lbs. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||