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).
Requesting reliability testing of various aluminium alloys for new 'Condor' Series III crankcases.
| Identifier | ExFiles\Box 37\3\ scan 088 | |
| Date | 7th March 1923 | |
| Hs.{Lord Ernest Hives - Chair} RHE. X3176 c. R.{Sir Henry Royce} c. GJ c. BJ c. Bv Rg{Mr Rowledge}6/W7.3.23 X3176 X4537 In order to test the reliability of the various aluminium alloys we are using, we have designed the test piece shown on N. Sch. 1541 herewith. The intention is to carry out tests with the shafts rotating at 1000 r.p.m. and to make the tests at ordinary air temperatures and at the temperature of boiling water. To enable this to be done water should be fed into the centre of the shaft, and a flame applied not exactly at the breaking point, the water keeping the temperature of the specimen uniform. I want to get this test rigged up and run as early as possible, particularly on the following materials, so that we can have the information before we cast the new "Condor" Series III crankcases:- 1. Standard Air Ministry L.5 Specification. 2. R.R. Specification 220, which we use for Aero Engine Crankcases. This should be kept on the light side, as near as possible identical with the material in the Engine which attempted the Type Test. 3. Hall's Light Crankcase Alloy. I also want you to obtain a test piece from the Silumin people, and I believe also that Mills of Birmingham are making a special Silicon Alloy, of which we might usefully obtain samples. Rg.{Mr Rowledge} Rg{Mr Rowledge} | ||