Comparative stiffness, deflection, and rating of 'SS' springs versus the standard 40/50 HP springs.
| Identifier | ExFiles\Box 16\7\ Scan166 | |
| Date | 11th April 1929 | |
| BY. {R.W. Bailey - Chief Engineer} from Hs {Lord Ernest Hives - Chair} /Rn. {Mr Robinson} c. to DA. {Bernard Day - Chassis Design} X7410 Hs {Lord Ernest Hives - Chair} /Rn {Mr Robinson} 7/LG11.4.29. 'SS {S. Smith} ' SPRINGS. Hs. {Lord Ernest Hives - Chair} said that R. {Sir Henry Royce} mentioned that he wanted the S.S. springs to be 10% stiffer because the rating was now so low that the back of the car fell or rose too much when the passengers got in and out. We think that R. {Sir Henry Royce} and Hs. {Lord Ernest Hives - Chair} were both under the impression that the S.S. springs were of much lower rating than the 40/50 HP. Actually all 40/50's now are sprung for normal load with a buffer clearance of 4.125" which gives an initial spring deflection of 8". The S.S. is sprung for normal load with a deflection of 8.250" so that the actual difference in the effective rating of the two springs is only 3%. We therefore are holding the instructions for the 10% stiffer S.S. springs over until we hear further on the subject. Hs {Lord Ernest Hives - Chair} /Rn. {Mr Robinson} | ||
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).