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).
Testing different Avon tyre types for squeal.
| Identifier | ExFiles\Box 156\3\ scan0275 | |
| Date | 16th December 1941 | |
| ROLLS-ROYCE LIMITED. 1331 Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} 11/OH.16.12.41. car 9040 9010(C) AVON TYRES. Herewith a report on special tyres supplied by Avon India Rubber Co. The tyres submitted to us for test were in three categories : 1. Avon Special Speed Tyres (five-bar centre traction pattern.) 2. Avon Standard Silent Tyres with 1" radii at tread edges. 3. Avon Standard Silent Tyres with special tread compound. We are unable to distinguish any difference between any of these tyres from a squeal point of view, as they all squeal at 15 - 16 m.p.h. Herewith Table: - Squeal. Standard LC.7466 - LC.7404 - LD. 1987 - LD.1979. 15 - 16. Speed Tyres five-bar pattern. LH.{Mr Haworth}3530 - LH.{Mr Haworth} 5022 - LH.{Mr Haworth}5070 - LH.{Mr Haworth} 5081. 15. - 16. Silent Tyres 1" radii tread edge. 15 - 16. Silent Tyres Special tread compound LH.{Mr Haworth}4656 - LH.{Mr Haworth}4654 - LH.{Mr Haworth} 4603 - LH.{Mr Haworth} 3538. 15 - 16. Pressures used on all tests : Front 25 lbs. Rear 28 lbs. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Copied Rm{William Robotham - Chief Engineer}/h.{Arthur M. Hanbury - Head Complaints} 22.12.41. | ||