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).
Outlining Mr. Royce's questions regarding engine side thrust, connecting rods, and crank web designs.
| Identifier | ExFiles\Box 10\2\ 02-page62 | |
| Date | 22th November 1940 | |
| Test. W.II.Ch. James & Talbots .L.W. Wolseley In taking this matter up with Mr. Platford, he wishes to go into the question of side thrust on the pins when running on an incline. He understands that at present, the Wolseley and Napier are the only two makes of car on the market that have their engines fitted with a separate thrust collar at one end and "dished" webs at the other. He does not see why the three inch bearing should not be quite sufficient to take the thrust in both directions. To work out what side thrust you would get, you would take the weight of the piston, plus connecting rod, and resolve its effect by drawing a triangle of forces as Mr. Halford did with his omnibus connecting rods. The result should be most interesting. This should also be compared with a similar drawing of the De Dion engine, showing the effects of the short connecting rod and the peculiar shape of the crank webs. Mr. Royce wishes to have the drawings of the connecting rod and piston sent him as soon as possible with the weight of each. He wishes the following points to be gone into:- 1) What advantages can be claimed for the present arrangement as against the old type with one short and one long bearing, the long one taking all the thrust. 2) What is the advantage of dished webs, and if good why not have them at both ends. .C.J. | ||