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. regarding the performance characteristics of a lining and arranging a meeting to discuss further.
| Identifier | ExFiles\Box 140\4\ scan0159 | |
| Date | 28th January 1938 | |
| 1180 January 28th.1938 Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}4/AP. Messrs. Ferodo Ltd., CHAPEL-EN-LE-FRITH. Your Ref. WES/PW. For the attention of W.E.Shilton Esq. Dear Sirs, We shall be glad to see Mr. Shilton on Monday, the 31st. and Mr.Longley also if he wishes to come over, at about 11.00 a.m. The production of a lining which permanently retains the desirable /u speed characteristics is not likely to be easy. The problem may resolve itself into the maintenance, in a given lining, of a certain physical or mechanical condition, e.g. possibly slightly porous. Your V.G.91, for instance, though excellent when new, when thoroughly bedded loses its good features to a large extent. In this it resembles many other Ferodo linings. In fact the American Thermoid is the first lining we have met which permanently retains the desirable /u speed characteristic, but the defect here is that it only does so when warm. The first questions needing an answer, it seems to us, are:- (a) Is the desirable /u speed characteristic dependant on the chemical nature of substances.? (b) Or is it due to their physical condition.? (c) If it is due to their physical condition, is it because air films play a part in friction.? We might discuss this further on Monday. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||