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).
Typed memorandum discussing crankshaft design, including pin lengths, disc-web shafts, and comparisons to racing engines.
| Identifier | WestWitteringFiles\T\November1928\ Scan127 | |
| Date | 28th September 1928 guessed | |
| contd :- -12- We think we can increase the lengths of the pins very considerably at the expense of the webs, as shewn, provided the latter are made really wide. Disc-web shafts sometimes have very thin discs, those on the Hispano being only .475 thick. The pins and journals overlap on the attached sketch. Since this shaft would involve a lot of special parts to test it out, it would be essential to do preliminary model tests on a single crank to check the calculated figures of stiffness, inertia, and balance. We know that this is the type of shaft used in plain bearing racing car engines, some of which attain speeds of over 10,000 r.p.m. In these special engines the size and weight of the crankshaft is always out of all ordinary proportions to the size of the other engine components. Hs{Lord Ernest Hives - Chair}/S.S.Tresilian. | ||