The breakage of front road springs and a proposal to improve their lifespan by varying the overhang.
| Identifier | WestWitteringFiles\M\October1924-December1924\ Scan18 | |
| Date | 21th October 1924 | |
| HS. {Lord Ernest Hives - Chair} ) FROM DA. {Bernard Day - Chassis Design} ORIGINAL DA {Bernard Day - Chassis Design} 1/M21.10.24. X2628 X9410 re. FRONT ROAD SPRINGS - 12 1/2% THIN LEAF. Referring to the reports of the breakage of the bottom leaf of these springs, and to the note on the bottom of Mr. Royce's R2/M161024, a rough analysis of the material in the spring indicates that there is more metal at the ends in proportion than in the middle. This is roughly 25%. We know that most of this is unavoidable owing to the construction of the spring, but we think this proportion might be improved by varying the lengths of the overhang. Strictly speaking the length of the overhang on any particular blade ought to be in some relation to its thickness so as to keep a constant bending moment, but as the springs are made now the available space is divided into equal lengths, and so there is a constant overhang regardless of the thickness of plates. Could this matter be taken up with the spring makers? We do not wish to dogmatise on it, and we realise that it is a matter for the spring makers to do the best they can, but as the general result should be to improve the length of life of their springs, one would think they would be eager to do what they could. DA. {Bernard Day - Chassis Design} | ||
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).