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. concerning solid tyres and wheels for dynamometer tests.
| Identifier | ExFiles\Box 157\1\ scan0117 | |
| Date | 30th April 1934 | |
| DUNLOP RUBBER CO., LTD. TELEGRAPHIC ADDRESS: "DUNLOPS, PHONE, BIRMINGHAM" TELEPHONE: BIRMINGHAM CENTRAL 4108 (P.B.E.) EXTENSION No. 395. YOUR REF: OUR REF: HEP/LW.583. X6050 FORT DUNLOP ERDINGTON BIRMINGHAM Messrs. Rolls Royce Limited, DERBY For the attention of Mr. Grylls. 30th April, 1934. Dear Sirs, Solid Tyres and Wheels for Dynamometer Tests. Our Works advise us that they hope to effect delivery of the pair of twin rear wheels with centre dimensions suitable for fitting to 20 HP. hubs but with bands to take 8"/720 single tyres, in approximately one month, as we find that the design involved, owing to its construction and size, necessitates obtaining special material. We take it that you will wish us to have these wheels fitted with tyres before despatch, and no doubt you will advise your Purchases Dept. of this matter so that we may enter our quotation. On the question of the operation of the 8"/720 tyre, unfortunately, we have no figures which could be considered relative to your requirements to enable us to answer the queries you raise in your letter of the 20th. We would, however, state that the maximum running temperature should not exceed 100ºC. It would be possible to control the matter by means of a thermo-couple and for our own work on an 8" section tyre we should insert this couple from the side at a depth of about 38m/m from the top of the tread inwards to the spew line which is the centre of the tyre. We drill holes for this Junction with sharp edged rods 1/8" square section, the first inch of the hole being opened out with a tool made by filing four flats on a steel rod, leaving a sharp point, thus acting as a form of countersink thereby relieving the frictional grip on the outer end of the junction. | ||