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).
The development and testing of rear spring brackets and insulators, including results from a Hupmobile test vehicle.
| Identifier | ExFiles\Box 28\1\ Scan024 | |
| Date | 25th October 1925 guessed | |
| Oy2-E-11823 -2- (2) The rear spring drawings show, III the front end bracket of the rear spring with first attempts at rear axle and centre brackets, IV the revised rear axle bracket, V, the general revised lgout and VI the revised centre bracket. An attempt has been made to reduce the rear axle bracket so as to preserve the existing frame clearances, and to lighten the centre bracket. The best that can be done with the centre bracket appears as though it would be large and clumsy, and we suggest that the present metal centre pivot be retained, but that the hollow pin be used as a reservoir of oil, with wick feed as used on all U.S. army trucks. We think that with the cushioning effect of the insulators at each end the centre pivot would probably run almost forever without developing slack, particularly if supplied continuously with oil. The Hupmobile fitted with insulators in February has now run over 7000 miles, and no change in the insulators is to be seen. The most fascinating advantage of these is their absolute silence on rough roads. There is a complete absence of those metallic shocks on rough roads which one scarcely notices when they are present, but of which the absence when they are eliminated is a great relief. Oy. MO/E | ||