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 discussing the suitability and heat treatment of P.2 and R.R.53.C alloys for a damper casing.
| Identifier | ExFiles\Box 152\2\ scan0032 | |
| Date | 16th September 1937 | |
| 1293 Rm{William Robotham - Chief Engineer}/Les.4/MH.{M. Huckerby} 16th. September 1937. Gordon Armstrong Esq., Waltham Works, Beverley, Yorks. Dear Mr. Armstrong, I have received a letter from Mr. Bogg asking for further particulars of R.R.53.C. and have just been talking to our two metal experts and inventors of the R.R. alloys. They are both strongly of the opinion that P.2. alloy would be difficult to cast for your damper casing, whereas R.R.53.C. should be simple. With regards to bearing qualities of the metal, both our experts consider R.R.53.C. considerably superior to mazak, and think there should be no trouble in running the shaft without bushes. The only heat treatment required after casting is to soak the castings for 20 hours at 175°c. This will give a high brinell figure. The high temperature heat treatment as specified for the similar metal R.R.53.B. by the Birmingham Aluminium co., of 510°- 535°c for 2-4 hours would be injurious in this case and probably cause small cracks. We should be pleased to use dampers without bushes provided that their life would last for the life of the car. There would naturally need to be a lot of endurance testings before we could discard bushes. | ||