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 Borg & Beck regarding 'Hyco' friction fabric for a 10' driven plate on a Bentley chassis.
| Identifier | ExFiles\Box 129\1\ scan0010 | |
| Date | 14th September 1936 | |
| Telegrams BORGANBECK, LEAMINGTON SPA. Telephone LEAMINGTON SPA 1550-1. X1110 BORG & BECK COMPANY LTD. MANUFACTURERS OF CLUTCHES. Registered Office BROCK HOUSE, LANGHAM STREET, LONDON, W. 1. WORKS: Tachbrook Road, LEAMINGTON SPA. Warwickshire. Directors E.{Mr Elliott - Chief Engineer} B. BOUGHTON. W. EMMOTT. D.{John DeLooze - Company Secretary} T. BROCK. Your Ref. Hs{Lord Ernest Hives - Chair}/Smth.14/FW Our Ref. S/HTB/MBL 14th September 1936. Messrs Rolls-Royce Limited., DERBY. Attention Mr. F.{Mr Friese} Ll Smith. Re 'Hyco' Friction Fabric Dear Sirs, We have to acknowledge receipt of your letter of the 10th inst, and note that you are now fitting up the 10" Driven Plate faced with English 'Hyco' Material to a Bentley Chassis, and that you propose testing same with our Model 10.A6 Clutch fitted with twelve Cream Springs. Taking the high limit of the Thrust Springs, this represents a total plate pressure of 1620.lbs; we feel that it may be possible to reduce this Plate Pressure in actual practise, but this will of course be the subject of experiment by your good selves. We note that you would prefer to utilise the present plate pressure as is now employed on our 10.A3 Clutches being supplied to you, which again taking the high limit represents approximately 1400.lbs If the latter Plate pressure was used then with the maximum torque of the Bentley Engine taken as 206.lbs.ft a theoretical /u of .22 would be obtained. We do not have figures before us representing actual tests of the English 'Hyco' Material, but we are advised that in connection with the American product a /u of .25 should be taken as compared with a /u of .3 for Moulded Facings. -continued- | ||