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 Rubber Co. Ltd. regarding tyre power consumption test results.
| Identifier | ExFiles\Box 45\2\ Scan246 | |
| Date | 11th March 1930 | |
| x 4050 . DUNLOP RUBBER CO.,LTD. TELEGRAPHIC ADDRESS: "DUNLOPS," PHONE, BIRMINGHAM. TELEPHONE: BIRMINGHAM CENTRAL 4108 (P.B.E) EXTENSION No YOUR REF: OUR REF: WB.{Mr Brazier/Mr Bell}AGP.R.8.113. FORT DUNLOP ERDINGTON BIRMINGHAM Messrs. Rolls-Royce Ltd., Experimental Department, DERBY. 11th. March. 1930. Attention of Mr. W.A. Robotham. Dear Sirs, Further to ours of the 24th. instant. We enclose herewith blue prints showing graphically the power consumption at various loads, inflation pressures and speeds for 7.00-21 Standard (Normal) Silent tyres and 6.00-19 Fort Dunlop Silent tyres. These results were obtained on a 32" diameter steel drum and are 20 to 30% higher than would be obtained on a flat surface. We hope to let you have the particulars relating to the 33x5 size within a few days. Yours faithfully, For THE DUNLOP RUBBER CO. LTD., Development Manager. -------------------- | ||