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).
Analysis and testing of Eagle connecting rods made of mild steel.
| Identifier | ExFiles\Box 42\2\ Scan018 | |
| Date | 13th August 1918 | |
| To R.{Sir Henry Royce} from EH. c. to CJ. E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} C O P Y. X.3280 - EAGLE CONNECTING RODS MADE OF MILD STEEL. These rods were made of mild steel. The analysis was as follows :- Carbon .23% Manganese .65% Silicon .27% Sulphur .022% Phosphorous .020% The brinell figure taken on the partly machined rods was - 129. Two sample pieces of similar steel with the same heat treatment stood 1405 and 1167 blows with the std. drop of 2" on the hammer on Stanton test. We tried two more test pieces with the drop reduced from 2" to 1.35", the pieces then stood 4244 and 3889 blows. The tensile test on this steel was :- | MS. | YP. | E.{Mr Elliott - Chief Engineer} | RA. | | 26.0 | 19.0 | 26.0 | 57.0 | The 3 1/2% N.S. which we are using for rods has the following tensile :- | 55.0 | 42.0 | 16.0 | 40.0 | Stanton minimum 4000 blows - 2" drop. A set of main rods made of mild steel have run for 25 hrs. full power on an Eagle engine at 1800 r.p.m. The engine was run on the hangar test. The rods are still in contd :- | ||