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).
Composition of light alloys used for bearing caps and pistons.
| Identifier | ExFiles\Box 142\4\ scan0005 | |
| Date | 1st December 1925 | |
| Hs{Lord Ernest Hives - Chair} RECEIVED DEC 1 1925 Hs.{Lord Ernest Hives - Chair} Rs.{Sir Henry Royce's Secretary} RUC RY/ RY/S X4112 BY8/H.{Arthur M. Hanbury - Head Complaints} 1.12.25. LIGHT ALLOYS. 1. Please note that the bearing caps recently supplied for use with Electron crankcase on R.R.F.X, are not pure magnesium as we originally supposed. This particular alloy which is being used is one consisting of:- 4% aluminium. 96% magnesium. 2. In regard to pistons, the alloy actually used so far has been pure magnesium produced by the Michel process. 3. The same people, however, are recommending an alloy which consists approximately of:- 4% copper. Balance magnesium. For pistons, I propose to have a set of the forgings for Phantom pistons which we have on order, delivered in this last alloy. Under this scheme we would have one set of pure magnesium and one set of copper-magnesium. All of these alloys are forged. BY.{R.W. Bailey - Chief Engineer} | ||