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).
Front spring specifications for sports cars, including working stress and deflection.
| Identifier | ExFiles\Box 67a\2\ scan0029 | |
| Date | 30th September 1927 guessed | |
| contd :- -2- (6) Actual working stress. The total deflection of a spring used in this manner is 6.4" + 3.3" = 9.7" + .5" for buffer. In other words, the 25% stiffer spring will only be deflected through .825" the range of the standard spring of equivalent rating and its stresses can be increased correspondingly. . standard specification for 25% stiffer spring is 1.4" initial camber. 6.4" deflection .5" cut off rubber buffer. Approximation FRONT SPRINGS. R.{Sir Henry Royce} has agreed that for Sports cars we must drop the front of the car .50". To do this the normal spring camber under load will be 1.00" negative with the same rating, or a free camber of 2.10". The buffer depth will be reduced by .5". The large aluminium packing now fitted under the springs to reduce the number of spring clips should be deleted, only the minimum packing to be fitted to give the necessary pivot lean. R.{Sir Henry Royce} was very emphatic on this point and it should give us .250 to .500" advantage in lowering the front of the car. ----------- HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||