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).
Small modifications to the Wraith III Crankshaft to reduce manufacturing costs.
| Identifier | ExFiles\Box 8\5\ 05-page03 | |
| Date | 5th March 1937 | |
| Service Podes 617 Groth SECRET. BY.{R.W. Bailey - Chief Engineer} c. Rm.{William Robotham - Chief Engineer} HPS.{Horace Percy Smith - Experimental Factory Mgr} E/JNR.{Charles L. Jenner}3/HP.5.3.37. Wraith III Crankshaft. We send you herewith:- LeC.5557 showing some small modifications to the crankshaft. These have been made by Mr Naylor, and we have agreed to them, as they reduce the manufacturing cost. The points are as follows:- (1) A common radius .093 for ground diameters to save changing the grinding wheels. (2) The 1.250" bore at the nose of the shaft is deleted, to save a boring operation. (3) The width of the slabs has been slightly reduced to increase the side clearance of the grinding wheel when producing the crankpins and journals. E/JNR.{Charles L. Jenner} LeC.5557 herewith. | ||