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).
Analysis and comparison of American car springs with English springs.
| Identifier | ExFiles\Box 43\2\ Scan060 | |
| Date | 13th July 1925 | |
| To Hs.{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design} (3900 DAL/M13.7.25. SPRINGS ON AMERICAN CAR. X.3900 X.8410 We should very much like to take one of these springs off the chassis, take it to pieces, and thoroughly measure it up as regards the thickness of all the plates, and their free camber. We should also like to know whether the plates are of fairly uniform thickness all along, as we found on some English springs similarly measured up, that there were great variations in thickness along the length of the plate. A calculation shews that the amount of steel in these springs is slightly less than that in one of the 12 1/2% 'V' springs in proportion to the work done by the spring, so that there is no reason from the design point of view why the 12 1/2% springs should not last as long as the American springs. It appears to be a question of manufacture, and especially we should think in the accuracy of the manufacture of the plates. In addition to the details of the plates you would no doubt send us exact information regarding the load and the free camber. DA.{Bernard Day - Chassis Design} | ||