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).
Letter to Ferodo Ltd discussing a 'noisy when hot' brake lining and suggesting a testing procedure.
| Identifier | ExFiles\Box 141\1\ scan0264 | |
| Date | 19th March 1937 | |
| 1180. Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}8/R.{Sir Henry Royce} 19th March, 1937. J.N. Longley, Esq., Chief Chemist, Messrs. Ferodo Ltd., Chapel-en-le-Frith. Dear Mr. Longley, In view of your remarks on the telephone I shall come over next Tuesday and arrive shortly after 10.a.m. In my last letter I said that S.5584 was "noisy when hot". This is not strictly correct. What we actually found was that after running this lining up to 570°F or 600°F several times, allowing it to cool right off between runs, when dead cold it had a high co-efficient and the brake emitted a loud squeak. I think it would be a good thing if you were to run the brake you have just rigged up, up to this temperature several times before Tuesday next, taking 2 or 3 minutes over the run, and allowing the drum to cool right off between runs. It is a tedious process and our tests take a long time to complete in consequence. Yours truly, | ||