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).
Modifications to the Phantom III Crankshaft, including changes to the journal bearings, crankpins, and connecting rods.
| Identifier | ExFiles\Box 93\5\ scan0137 | |
| Date | 23th June 1937 | |
| Handwritten: Sude- You can now urge this Rm{William Robotham - Chief Engineer} Liles 317 BY.{R.W. Bailey - Chief Engineer} c. Rm.{William Robotham - Chief Engineer} HPS.{Horace Percy Smith - Experimental Factory Mgr} E/JNR.{Charles L. Jenner}1/HP.23.6.37. Phantom III Crankshaft. ---------------------- We send you herewith:- LeC.5750 showing the crankshaft made with increased areas for the journal bearings and the crankpins increased in width. This gives more area both for the forked connecting rod and the blade rod, the amount being .3 wider. This will make the crank slabs .15 thinner. The thickness of the bearing shells has been reduced by .062, and HPS{Horace Percy Smith - Experimental Factory Mgr} will tell us if he considers these can be manufactured satisfactorily. The drawing shows the Packard type of balance weights. Since the forked connecting rod is wider it will be necessary to make the gashes in the cylinder skirt bigger to accommodate the rod when withdrawing the piston pin. It is very doubtful whether we can make these rods from the existing forgings. E/JNR.{Charles L. Jenner} | ||