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 tests for Chassis 93 NK at various tyre pressures.
| Identifier | ExFiles\Box 71\4\ scan0281 | |
| Date | 8th July 1925 | |
| 48940 Hotel de France, Chateauroux, Indre, France. GWH.{George W. Hancock - Head Chateauroux}1/Crn.8.7.25. To: "HS{Lord Ernest Hives - Chair}" From: G.W.Hancock. Re Chassis 93 NK. Steering tests carried out on 93 NK. Front tyres carefully balanced. Tyre pressures 60 lbs., 40 lbs. & 20 lbs. Tests at 60 lbs. pressure - there are no high speed wobbles, but at speeds of 60 m.p.h. and over, steering is unstable. This is on good roads. On uneven roads, there is a feeling that the wobbles are there, but they do not materialise. At low speeds, there are no wobbles, also there is very little tendency to self centre. Shocks on steering wheel are slight. Tests at 40 lbs. pressure - High speed wobbles 60 to 64 m.p.h. These are more pronounced, but do not build up. Steering is much more comfortable to handle at this pressure. Shocks on steering wheel are more pronounced. Self centering is not so good. At speeds below 20 m.p.h. steering is very heavy & will not centre. There are no wobbles at low speeds. Tests at 20 lbs. pressure - there are no high speed wobbles. Steering is very bad for road shocks, which start at 35 m.p.h. approximately. There are no low speed wobbles. With this pressure, car is very hard to hold to centre of road. It is very bad on corners, and almost impossible at low speeds. Conditions of roads during test were dry. Lean of pivots will be checked up. We are to-day trying the same tests with un-balanced wheels. G.W.Hancock. | ||