Commenting on test results for tyre noise and suspension modifications on the Phantom III.
| Identifier | ExFiles\Box 157\1\ scan0325 | |
| Date | 23th April 1936 | |
| X1332 To Sg. {Arthur F. Sidgreaves - MD} from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} c. to WOP. c. to E. {Mr Elliott - Chief Engineer} Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} 1/KW.23.4.36. Phantom III Tyre Noises. With reference to Sg. {Arthur F. Sidgreaves - MD} 12/E.21.4.36, there are several points on which we should like to comment :- (1) 33-EX was passed by Cx. {Major Len W. Cox - Advertising Manager} fitted with the tyres which we are proposing to standardise, i.e., the old type Dunlop 90. We were personally present during the test and it was agreed over our course, near Lillie Hall, that this car was as good as the Phantom II. (2) It did not take the Experimental Dept. until Easter to discover that a new spring was necessitated by the rubber shackles. We had an experimental rubber shackle scheme copied from the Cadillac which necessitated a new spring running on a Ph.III last year. What has taken a long time is to come to any firm decision as to exactly what to ask the design people for for production on the results of tests on one car. Discounting 30-EX as hopelessly obsolete, it is correct to say that 33-EX has been the only car available for rubber shackle tests up till the end of March. 34-EX has been in pieces in the Test Dept. being rebuilt since it was returned from Sales. (3) Since Easter we have had four cars available for these tests, and as outlined in E.4/HP.17.4.36 we have now got a much better idea of the value of the various modifications. It is quite clear that the difference between cars completely overshadows the advantages we gain from our various modifications. One point has, however, emerged from these tests and that is that the rubber between the axle and the spring is relatively better than we at first thought. This of course is a safer move than the rubber shackle. | ||
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).