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).
Fatigue tests on various model crankshafts for the 'F' engine.
| Identifier | ExFiles\Box 63\4\ scan0101 | |
| Date | 20th December 1929 | |
| RHC.{R. H. Coverley - Production Engineer} Dpt. Hs.{Lord Ernest Hives - Chair} R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence) C. Sg.{Arthur F. Sidgreaves - MD} E.{Mr Elliott - Chief Engineer} X 4499 Rg{Mr Rowledge}2/LW.20. 12. 29 MODEL TEST CRANKS Further to my note reference Rg{Mr Rowledge}/SFP2/LW.15.1.29 instructing fatigue tests on model cranks for the "F" engine to test the relative strengths of the standard crank and the crank with the increased bearing area, will you please put in hand at once and test models of cranks of the increased bearing area type made in nitrogen hardening steel, and also in case-hardening nickel steel to Specn. No. 207C. These tests should give us some idea of the behaviour of these steels relative to our ordinary crankshaft steel under breakdown conditions of alternating stress. I am asking for the test on the case-hardening nickel steel owing to the doubts we have of being able to ensure that every shaft we make in nitro-alloy of a batch would be reliable. I regard these tests as important owing to the necessity of our getting better results from our bearings as soon as possible. We also have in hand crankshafts in normal crankshaft material but with the hardness increased to 341 and 369.brinell. We should also have models made of the same type in this steel for comparison with the standard ones now undergoing tests. By.{R.W. Bailey - Chief Engineer} will supply the specification for these. I should like R.{Sir Henry Royce} to say whether we should put in hand two case-hardened crankshafts with a view to putting one of these on a type test engine as soon as possible so as to hasten this improvement as much as possible. Rg.{Mr Rowledge} P.S. We require three off each type and they are to be models of modified crank to DES.989, as shown on DRS.995. | ||