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).
Various alloys for crankchamber castings and pistons, including suggestions for future reports and testing.
| Identifier | ExFiles\Box 36\3\ scan 023 | |
| Date | 15th February 1916 guessed | |
| Contd. 2. If this Magnálium was not prohibitively expensive and could be produced in sufficient quantity, I propose it should be tried for crankchamber castings, but its casting properties would first have to be proved. My impression is that these are very good. I think in any future reports you had better include whether an alloy can be obtained or made by us in quantity, its price for a given volume in decimals of a penny per cubic inch, its casting properties, its physical properties, its composition, and in the case of a piston alloy, its variat-ion in strength for temperature. Regarding the piston alloy, I felt that the Admiralty had gone too far in the alloy containing manganese, and I still think that even the alloy we are at present using is too advanced as regards strength at a high temperature, because of its great brittleness at lower temperatures. We could prove this, I think, by using an alloy which is known to weaken at high temperatures. So that we could now compare for pistons - (1) Our present standard piston alloy. (2) An alloy with considerably less copper. (3) A crankchamber alloy. (4) Magnálium. (5) The Levett metal. (6) The metal suggested by Mr. Hall. I should like Upton Lewis, Stanton or static tests of these alloys at varying temperatures, up to the temperature we consider the maximum attained by the pistons. In the case of a Co | ||