Programme of modifications for 'SS' braking systems, including new linings and other efficiency improvements.
| Identifier | ExFiles\Box 12\5\ 05-page093 | |
| Date | 16th April 1929 | |
| To RHC {R. H. Coverley - Production Engineer} from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} X7420 Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} /LG16.4.29 To AJL. from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 4/LG16.4.29. 'SS {S. Smith} ' BRAKING. We have condemned Tenoid brake lining. We have also condemned the original type of 'Halo' servo lining. We should like the following modifications made to the cars as soon as possible. Our programme is to gradually supercede all the Tenoid with Ferodo bonded asbestos, or 'Ferobestos' as the cars come into the Shop for modification. We do not think this alteration will affect the efficiency of the brakes much. We want to alter the efficiency by cams and improved supports. 1. Getting 19-EX and 20-EX fitted with the rear brake countershaft supports. <strikethrough>21-EX servo to be lined with woven cotton 'A' discs.</strikethrough> 2. Getting the servos lined with woven cotton discs or Ferodo. 3. If they are then too efficient, trying:- At present only G.74256 in Stores. G.74743 will be coming in almost immediately. (a) Lubrication of the woven cotton discs. (b) 45º cams with the Ferodo and dry cotton discs. <strikethrough>We are prevented from making any useful tests until we get all the cars fitted with the supports for the rear brake countershaft. Could you please push these.</strikethrough> On 20-EX we should like to try 45º cams at once to see if it prevents the present grabbing. We shall not get efficient braking on any car until we have the supports on the rear equaliser shaft. Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} | ||
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).