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 test results for 20 HP & 40/50 tyres.
| Identifier | ExFiles\Box 45\2\ Scan298 | |
| Date | 19th September 1930 | |
| X4050, DUNLOP RUBBER CO.,LTD. TELEGRAPHIC ADDRESS: 'DUNLOPS, PHONE, BIRMINGHAM'. TELEPHONE: BIRMINGHAM CENTRAL 4108 (P.B.E.) EXTENSION No. 482 YOUR REF: Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6./MJ OUR REF: HP/MS.11 Technical Representative, Manufacturers Division. FORT DUNLOP ERDINGTON BIRMINGHAM Messrs. Rolls Royce Limited, DERBY. 19th September, 1930. Dear Sirs, 20 HP. & 40/50 TYRES. With further reference to your letter of August 25th, we have pleasure in sending herewith a graph which will, we think, meet your requirements in respect of the above matter. Tyres of the 'Fort' Silent type were used for the test and it will be seen from the curves that at 80 m.p.h. an increase of 10 m/m in the effective radius of the 7.00-20, and an increase of 8 m/m in the effective radius of the 6.00-19 was obtained. Both tyres were inflated to 35 lbs/sq.in. for this test. Measurements were made of the tyre under its scheduled load, as well as running light and confirmatory figures were obtained. Yours faithfully, FOR DUNLOP RUBBER CO.,LTD., J G Parsons [STAMP: RECEIVED HS{Lord Ernest Hives - Chair} SEP 1930] | ||