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).
Page calculating torque on front wheels and its effect on steering pivots and springs.
| Identifier | WestWitteringFiles\K\November1923\ Scan66 | |
| Date | 22th November 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H. D.{John DeLooze - Company Secretary} -2- Exptl. No. 1559 REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG22.11.23. EXPERIMENTAL REPORT. equal to (55 X .6) cwts. or 33.0 cwts. If we now lock our front wheels on a surface having a coefficient of friction of .72, we apply a force of (33 X .72) cwts. at the tyre = 23.76 cwts. 23.75 cwts. Taking the effective tyre dia. as 16", this is equivalent to a torque of :- 16 X 23.75 X 112 ins.lbs. = 42.560 inch.lbs. through pivots. This is the torque that would have to be taken through the springs were no torque arm used, and we have roughly graphed the movement of the steering pivots under this torque, using the figures given in Hs{Lord Ernest Hives - Chair}1/LG20.12.21., and supposing the movement to continue as it started within the elastic limit of the springs. The consequent effect of the steering can be imagined, as also the sort of springs required if this torque had to be taken through them without excessive torsional axle movement. | ||