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).
Steering wobble tests conducted on chassis 93 NK at various tyre pressures.
| Identifier | ExFiles\Box 71\4\ scan0282 | |
| Date | 9th July 1925 | |
| X8940 Hotel de france, Chateauroux. Indre. France. GWH.{George W. Hancock - Head Chateauroux}1/Crn.9.7.25. To: "HS{Lord Ernest Hives - Chair}" From: G.W.Hancock. Re Chassis 93 NK. We have carried out a further series of tests on the steering, with the front wheels out of balance approximately 1/4 lb. With tyres at 60 lbs. pressure. We cannot obtain any wobbles at any speeds, and on our test the steering was not affected by the unbalanced wheels. At high speeds, the steering feels to be on the light side. At low speeds, there is an improvement over 40 lbs. pressure. With tyres at 40 lbs. pressure. There is a strong inclination to wobble at 60 to 64 m.p.h., but these do not build up. We are not getting the severe wobbles as we have previously reported. We cannot account for this. We have not altered either the lean of pivots, or interfered with the steering generally. Shocks felt on steering wheel are definitely more pronounced with this pressure. On one occasion only during the test have we got the wobbles that we have previously complained of. There is no sign of wobbles at low speeds. With tyres at 20 lbs. pressure. We can get wobbles by starting them between 54 and 58 m.p.h., but these will not build up on their own. When we do get them, they are of a rather violent nature. Steering is heavy all round, and at high speeds it is very difficult to hold the car on the road, especially so when cornering. At low speeds it is almost impossible. We are now obtaining the lean of pivots, which we will let you have in to-morrow's report. G.W.Hancock. | ||