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).
Technical memo discussing the stiffness, torque, and potential weaknesses of a proposed frame structure.
| Identifier | ExFiles\Box 26\1\ Scan043 | |
| Date | 19th March 1964 | |
| - 6 - The 25W torque subtracts from the twist caused by the torque about the longitudinal axis so the twist is that corresponding to a torque of 35W about the longitudinal axis. For this frame then, the twists in the two conditions are in the ratio of 125:35. Assuming that a frame at floor level can be built having a stiffness of 3500 lb. ft/° with conventional loading, the load crossing would increase the stiffness to 12,500 lb. ft./°. There is no reason why this basic feature should not be used to advantage on a saloon but the primary aim is to design an adequately stiff structure at floor level which leaves the stylist a free hand with the super-structure. It is appreciated that the first thought of the reader may be that the above reasoning contains a carefully concealed fallacy but a very crude small model has enabled the predicted trends to be observed and a properly designed and constructed model should provide a convincing demonstration. A possible weakness of the above argument is that the structure is stiff for certain loadings only. These loadings are the ones which normally excite shake of the structure but it may happen that the proposed structure could shake if excited by some agency other than the wheels. The object of this note is not however to present a complete proposition but to indicate the existence of a possible line of development. [Signature] Tln/CJC. | ||