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).
Design modifications for B.V. Series brake drums.
| Identifier | ExFiles\Box 120\1\ scan0272 | |
| Date | 4th April 1939 | |
| 1028 By/Ald.{F. Allwood - Experimental Design} from Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. RHC{R. H. Coverley - Production Engineer}/Vs.{J. Vickers} c. HPS.{Horace Percy Smith - Experimental Factory Mgr} Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}4/R.4.4.39. B.V. Series Brake Drums. With the new brake lining running in France on 8.B.V., less cooling area is necessary on the brake drums. This means less ribbing. We think that two large ribs and one small should be sufficient. The ribs can then be spaced so that they can be cored out, resulting in a much finer grain on the rubbing surface. The present coarse grain must be partly responsible for the bad wear we are getting from brake linings. Will you please draw and instruct a set of four drums, plus necessary spares, for tin wheels. Two drums are not to have the ribs machined, the other two should be cleaned up to ensure balance, as out of balance leads to increase of tyre wear, and the americans sometimes have to balance their drums. We would like to know what difficulties, if any, are encountered in machining the ribs. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||