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).
Tensometer test results for brake drums in RR.53C following various heat treatments.
| Identifier | ExFiles\Box 85\1\ scan0341 | |
| Date | 16th June 1937 | |
| File in Bentley Bake File .206 M.1348. To Rm.{William Robotham - Chief Engineer} from H1/EJW. HL/EJW.1/AG.16.6.37. Laboratory. BRAKE DRUMS IN RR.53C. As requested by Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} we have made tensometer tests on test bars supplied from three drums which had received the following treatments. Drum No. 1. Soaked for 6 hours at 170°C. then " " 20 " " 190°C. then again " " 20 " " 190°C. Drum No.2. Soaked for 6 hours at 170°C. then " " 6 " " 190°C. then again " " 6 " " 190°C. Drum No. 3. Soaked for 6 hours at 170°C. then " " 6 " " 230°C. then again " " 6 " " 230°C. Tensometer Test results. Drum No. Test Bar No. Ult. Str. Tons/sq.in. Elong. 1 1A 9.4 2.0 1 1B 9.4 1.8 1 1C 9.4 1.8 2 2A 10.8 1.0 2 2B Broken in machining. 2 2C 10.5 1.0 * 3 3A 9.3 2.0 3 3B 9.8 2.7 * 3 3C 9.6 2.5 (Broken in radius of T.B.) * Small oxide inclusions at point of fracture. HL/EJW | ||