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).
Instructions for preparing a modified flexible flywheel for a Wraith or Bentley model, detailing parts and modifications.
| Identifier | ExFiles\Box 85\2\ scan0355 | |
| Date | 3rd June 1938 | |
| 212 also 612 To HPS.{Horace Percy Smith - Experimental Factory Mgr} c. to Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} c. to Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}8/JH.3.6.38. FLEXIBLE FLYWHEEL, WRAITH OR BENTLEY. Please prepare another flexible flywheel to the following drawings herewith. RM.{William Robotham - Chief Engineer}533 Arrg. RM.{William Robotham - Chief Engineer}534 Flywheel 1 off S/M not heat treat. RM.{William Robotham - Chief Engineer}535 Inertia ring 1 off S/M not heat treat. RM.{William Robotham - Chief Engineer}536. " 1 " " " " " " " RM.{William Robotham - Chief Engineer}537 Flexible disc 1 " S/N heat treat. RM.{William Robotham - Chief Engineer}538 Bolt 8 " " " " " " RM.{William Robotham - Chief Engineer}539 " 6 " " " " " " " RM.{William Robotham - Chief Engineer}503 HOUSING. 1 " S/M not heat treat. EX.30868 Spigot bearing 1 " S/M not heat treat. " Bolt, coupling 12 off S/N heat treat. (suggest make 3 sets of these bolts) This wheel is generally similar to the previous one Rm.{William Robotham - Chief Engineer}498 but with the following modifications. (1) Disc is thinner to provide increased flexibility. (2) The inertia ring is reduced so that the crankshaft can be removed without removing flywheel. (3) It is drilled for either 10" or 11" B. & B. clutch. These parts enable us to try wheels of four different inertias. Rm{William Robotham - Chief Engineer}/NRC{N. R. Chandler}, | ||