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).
Comparison of bearing loadings between the Wraith III and Bentley models, noting changes in journal and big end loads.
| Identifier | ExFiles\Box 115\1\ scan0351 | |
| Date | 10th June 1937 guessed | |
| To RM{William Robotham - Chief Engineer} 1020 Wraith Bearing loadings. We attach hereto Rm{William Robotham - Chief Engineer} 368 giving the polar diagrams for Wraith III journal loadings, & also comparative figures for Bentley & the larger dia. crankpin scheme. The following points are of interest. (1) On Bentley the intermediate journals are the most heavily loaded bearings. (2) On Wraith III the big end loadings are increased 3%, but the journal loadings are reduced 39% for the centre & 42% for the intermediates. (3) Apart from possible beneficial effects due to increased torsional stiffness, the larger pin diameter is of negligible advantage. | ||