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 regarding tensile tests, bursting speed, and coefficient of friction for No. 6 clutch material.
| Identifier | ExFiles\Box 141\1\ scan0142 | |
| Date | 15th May 1936 | |
| All Communications to be addressed to the Company FERODO LIMITED FERODO BRAKE & CLUTCH LININGS CHAPEL-EN-LE-FRITH, STOCKPORT, ENGLAND. TELEPHONE: 19 CHAPEL-EN-LE-FRITH (4 LINES) TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH. 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 BRIGHTON 84, QUEEN'S ROAD. BRISTOL 118, VICTORIA STREET. CARDIFF 39, CHARLES ST DUBLIN 120, UPPER ABBEY ST GLASGOW 70, WATERLOO ST LEEDS 25, [illegible] LIVERPOOL 1-3, BERRY STREET. MANCHESTER 32, CATHEDRAL ST NEWCASTLE-ON-TYNE WORSWICK CHAMBERS. 10, WORSWICK ST OFF PILGRIM ST Dr. F.{Mr Friese} Llewellyn Smith, Messrs. Rolls Royce Ltd., Derby. 15th. May 1936 YOUR REF. Hs{Lord Ernest Hives - Chair}/Snth3/KW OUR REF. JNL/KM Dear Dr. Smith, I thank you for your letter of the 14th. of May concerning the bursting speed of No. 6 material. At the time you communicated the results of your tensile tests on the American disc compared with the Ferodo No. 6 disc certain thoughts occurred to me which caused me to put your letter on one side for answering in detail. I think from the way the discs are made that the plain question of tensile is hardly sufficient indication of the quality of a clutch facing in withstanding centrifugal force. We are arranging to gear up the high speed end of our test machine to give 4,000 - 7,000 r.p.m., but it will be a week or two before we can get the materials for doing this. In the meantime we are carrying out tests to determine the coefficient of friction of No.6 at all temperatures, as you request. This will take two or three days. Yours faithfully, FERODO LIMITED M ougley CHIEF CHEMIST & DIRECTOR. | ||