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).
Axle modifications and brake performance, investigating vehicle wobble.
| Identifier | ExFiles\Box 29\1\ Scan050 | |
| Date | 15th September 1925 | |
| 493A (50 H) (D.D. 31. 12-6-25) J.H.B. EXPERIMENTAL REPORT. -2- Exptl. No. REF Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG15.9.25. has been increased and increased in weight which would increase its transverse moment of inertia. The angle of the king pin has also been altered very slightly. We are now carrying out investigations to see whether this had got any bearing on these results. The behaviour of the present axle when fitted with front brake parts is of an altogether different order from the wobble with the brakes removed. The amplitude of the wobble is much greater and it can be brought up with the slightest provocation occurring at speeds about 50 m.p.h. and building up on the overrun. This is the axle we demonstrated at W.W. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||