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 from Ferodo Limited concerning test results on two returned MR.3 brake linings exhibiting exudation.
| Identifier | ExFiles\Box 140\4\ scan0214 | |
| Date | 15th June 1938 | |
| 1180 All Communications to be addressed to the Company. FERODO LIMITED TELEPHONE: 250 CHAPEL-EN-LE-FRITH (8 LINES) TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH. FERODO BRAKE & CLUTCH LININGS CHAPEL-EN-LE-FRITH, STOCKPORT, ENGLAND. CODES: WESTERN UNION FIVE LETTER EDITION, BENTLEYS COMPLETE & 2ND PHRASE, MARCONI INTERNATIONAL, LIEBER'S CODE, LIEBER'S LATEST CODE, A.B.C. 5TH & 6TH EDITIONS. Depots:- LONDON 222, TOTTENHAM COURT RD W. 1. ABERDEEN 26, GUILD STREET. BELFAST 8,10 & 12, MONTGOMERY ST BIRMINGHAM 198, CORPORATION ST BRISTOL 118, VICTORIA STREET. CARDIFF 60, CHARLES ST DUBLIN 120, UPPER ABBEY ST GLASGOW 70, WATERLOO ST LEEDS 25, HUNSLET RD LIVERPOOL 1-3, BERRY STREET. MANCHESTER 16, JACKSON'S ROW, DEANSGATE. NEWCASTLE-ON-TYNE 2A, ELDON PLACE, BARRAS BRIDGE. 15th June, 1938 YOUR REF. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}14/JH. OUR REF. WES/PW. Messrs. Rolls-Royce Ltd., Derby. For the attention of A.F. Martindale Esq. Dear Sirs, We would refer to your letter of the 28th April with regard to two Ferodo MR.3 linings which you returned to us, and which were stated to have exhibited traces of exudation. We realise that we have been an unconscionable time in giving you a report on these two linings, and perhaps we should confess that we have really been at a loss to furnish you with some positive constructive information on these brake linings. In the first place, we had carried out extensive tests and have failed completely to obtain any trace of exudation. The coefficient of friction is very slightly lower than average but is within our standard limits. The wear value is good - our standard figure for such material being 200 B.H.P. hours per cu. in. whereas this gives approximately 236 B.H.P. hours per cu. in. We did observe slight black stains on the unworn surface of these liners, which appeared to us to have been caused by oil. The quantity was so slight, however, that it was impossible to effect an extraction. Assuming, however, that our surmise that this stain was due to oil is correct, this may supply the reason for the very slightly lower coefficient of friction and also possibly explain the actual exudation which in such a case would be attributed to carbonized lubricant. Yours faithfully, FERODO LIMITED. W.E.Shilton Technical Department. | ||