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 suggesting tests on 'Halo V' brake lining material as an alternative to 'Halo III' and describing the company's wear testing system.
Identifier | ExFiles\Box 141\1\ scan0259 | |
Date | 10th March 1937 | |
TELEGRAMS, BELTING, CLECKHEATON. TELEPHONE CLECKHEATON 318. BRITISH BELTING & ASBESTOS LTD. SCANDINAVIA MILLS, CLECKHEATON. TEXTILE BELTINGS. BRAKE & CLUTCH LININGS. ASBESTOS GOODS. HEAD OFFICE, 59. SOUTHWARK STREET, LONDON, S.E.1. ESTABLISHED 1880. [Handwritten Note: 1181.] [Handwritten Note: AFM{Anthony F. Martindale} File] Messrs. Rolls Royce Ltd., DERBY. 10th March, 1937. Dear Sirs, Attention of Mr. A.F. Martindale. We thank you for your letter of the 2nd instant, in response to which we would suggest that in addition to the "Halo III." material which we have already recommended, it might be of interest for you also to carry out tests with "Halo V". This is a material of the same special structure as Halo III., but has a lower coefficient of friction of the order of .32 - .34. We do not employ any of the commonly known wear factor systems for assessing the wearing qualities of our products, but prefer a system based on the number of hours required to wear away some unit of thickness under some constant condition of power absorption and temperature. You will doubtless recollect that this system and the reasons for its adoption were described in the writer's paper on "Brake Performance". In a test where the unit constant power absorption of one H.P./sq.inch is employed and where the temperature does not exceed 450° Fah., both Halo III. and Halo V.{VIENNA} will require approximately 21 hours running to remove .1" as compared with 18 hours for the general run of good quality non-metallic linings having equal stability of friction. Yours faithfully, BRITISH BELTING & ASBESTOS Ltd, [Signature] Research Engineer. EWS/MAF. | ||