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).
The redesign and strengthening of Phantom III connecting rods following a failure.
| Identifier | ExFiles\Box 93\1\ scan0131 | |
| Date | 28th May 1937 | |
| BY.{R.W. Bailey - Chief Engineer} RWSWDL. FOLLOW UP. URGENT. 314 c. Rm.{William Robotham - Chief Engineer} HFS E/JNR.{Charles L. Jenner}3/HP.28.5.37. Rm{William Robotham - Chief Engineer} Phantom III Connecting Rods. Owing to the occurrence of two broken connecting rods on the Nairobi car we have made a design LeC.5687 strengthening the lugs where they fractured. It will be remembered that there are limitations to what we can do in this direction because of withdrawing the piston pins from the top of the cylinder block. We have put a small amount on the height of the lugs and altered the curvature of the saddle, and added a small radius to the counterboring operation for the bolt head. This will result in an increase of 55% in strength at this point. LeC.5687 herewith. E/JNR.{Charles L. Jenner} | ||