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 supplier Hardy Spicer & Co. Ltd. discussing the construction and specifications of discs.
| Identifier | ExFiles\Box 5\5\ 05-page27 | |
| Date | 7th October 1930 | |
| Telegrams & Cables 'AUTOJOINTS, BIRMINGHAM' Code: BENTLEY'S PHRASE. X512. Hardy Spicer & Co., Ltd. Telephone BIRMINGHAM, EAST, 1221-2-3. Manufacturers & Patentees of the HARDY FLEXIBLE COUPLINGS & PROPELLER SHAFTS. Manufacturers & Patentees of the SPICER UNIVERSAL JOINTS & PROPELLER SHAFTS. Manufacturers & Patentees of THE BRITISH BOUND BROOK OILLESS BEARINGS. Manufacturers & Patentees of ALPE PATENT CORD COUPLINGS. Our Reference JAD/GJ Your Reference HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}2/AD Registered Offices and Works, Birch Road, Witton, Birmingham. 7th October, 1930. Messrs Rolls-Royce Ltd., DERBY. Dear Sirs, We thank you for yours of the 6th inst., and we are dealing with it now as Mr Hardy is away abroad, but when he returns we shall put the matter before him to see if there is anything to add to our reply. The Disc marked "A" was built up as you suggest, with less fabric and a special proofing rubber. When you wish to refer to this, we shall understand it as 22 Ply, White Proofing D, but otherwise quoting your own part number. We have put in hand twelve of these Discs without waiting for your order. Your last paragraph asks what we should use, if left a free hand, to suit your conditions. We should say that the difference in performance between the discs you have observed is due to the different handling of the vehicles, or the heavier work one may be doing to another. To increase the life and safety factor, we should use a Disc 190 outside diameter, 63 centre hole, 3/4" thick, Pitch Circle 140 with 6 - 1/2" holes. Yours faithfully, For & on behalf of HARDY SPICER & Co. LIMITED. C. Wainell ENGINEER. | ||