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 Dunlop regarding experimental tyre noise and subsequent alterations for further testing.
| Identifier | ExFiles\Box 45\1\ Scan202 | |
| Date | 13th May 1921 | |
| X.4050. By Appointment To H.M. The King. DUNLOP RUBBER CO LTD FOUNDERS OF THE PNEUMATIC TYRE INDUSTRY. TELEGRAMS: "COVERS, BIRMINGHAM." TELEPHONE NO.: EAST 920 (11 LINES). CODES: WESTERN UNION, 5 LETTER, BENTLEY'S. A.B.C. 5TH EDITION. REGISTERED OFFICES: "DUNLOP HOUSE," 1, ALBANY STREET, LONDON, N.W.1. WHEN REPLYING PLEASE QUOTE ON BOTH LETTER & ENVELOPE. ALL COMMUNICATIONS TO BE ADDRESSED TO THE FIRM. ASTON CROSS, BIRMINGHAM. Development Supt., 13th May, 1921. dict. 12th. Messrs Rolls Royce, Ltd., DERBY. Attention of Mr. Hives. Dear Sirs, We have to thank you for the opportunity given us to-day of again examining the Dunlop Straight Side Tyres on your test car. The tyres in question, as you know, were provided with an experimental tread in which the pattern was partly turned and cut out and not moulded. The increase of noise to which you have called our attention was found to be due to the creation of closed air pockets due to the elimination of the outlet provided by the central grooves, these having disappeared by now. On opening out the edges of the cross grooves, the noise disappears, and we have altered the tyres accordingly, and have left them for your further test. As we are now producing these tyres from our finished moulds, we should much appreciate your taking an early opportunity of equipping some of your cars with these new tyres. We have asked our General Sales Manager to get in touch with you on the subject Yours faithfully W.H. Paull Development Supt., | ||