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 the testing and failure analysis of fan belts.
| Identifier | ExFiles\Box 135\1\ scan0213 | |
| Date | 6th October 1938 | |
| File 1135 All Communications to be addressed to the Company. FERODO LIMITED TELEPHONE: 250 CHAPEL-EN-LE-FRITH (6 LINES) TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH. FERODO REGD. TRADE MARK. BRAKE & CLUTCH LININGS CHAPEL-EN-LE-FRITH, STOCKPORT, ENGLAND. CODES: WESTERN UNION FIVE LETTER EDITION, BENTLEY'S 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 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 24, ELDON PLACE, BARRAS BRIDGE. 6th October, 1938 YOUR REF. OUR REF. JNL/KM C. S. Steadman Esq., Messrs. Rolls Royce Ltd., Derby. Dear Mr. Steadman, I thank you for your letter of the 4th of October on the subject of fan belts. As requested we are returning the Gates Vulco belt. I kept this for quite a long time in the state in which it collapsed on the fan but eventually I had to cut it to demonstrate to a Meeting here the collapse of the cords. I am returning it, however, as you request, and you will see that the two ends marked 'AA{D. Abbot-Anderson}' are a common cut in the middle of the "waisted" portion of the belt. In view of your comments on the horse-power figures given in my previous letter, I have had these checked and to the best of my ability the following are the correct figures. First of all the formula is:- Volts x amps x motor efficiency --------------------------- 746 For the first fan with the Gates Vulco belt the maximum figures obtained were:- Volts 250 x amps 97 and the motor efficiency was 85% Thus H.P. = 250 x 97 x 85 / 746 = 27.5 H.P. 24.6 The fan speed for this reading was 4,380 and the driving speed 4,440 R.P.M. The average condition for the first fan and that obtaining when the fan collapsed is:- Volts 248 x amps 94 with the speed the same as above. This gives us an average consumption of 26.6 H.P. 23.8 - continued - | ||