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).
Continued report on steering box performance, comparing 'parking' and 'joggling' conditions.
| Identifier | ExFiles\Box 67\4\ scan0346 | |
| Date | 5th September 1932 guessed | |
| contd :- -2- purposes be irreversible. That the steering is more sensitive to any change for 'parking' than for 'joggling' we can demonstrate on the road by the use of different types of oil in the steering box. We can relatively easily spoil a steering in the forward direction, making it sticky and inclined to tighten up by certain oils, but joggles seem to be but slightly reduced. Briefly, parking conditions prevent us ever producing a worm and nut which approaches irreversibility for joggles. We consider that the new large dia. .900 worm and nut with the altered steering box leverage is the best we can do, but that the friction in the column will still be necessary to give the best results. A full report on the figures we have been obtaining will follow when we have completed our series of tests. The appended curves illustrate the widely different frictional conditions which exist when 'parking' and when experiencing 'joggles'. They are the average of a number of nuts and worms, all have the same characteristic. We have no difficulty in reproducing the results with regularity. The main point is that if the conditions of movement were the same for parking and joggling, the steering would be for all practical purposes irreversible as indicated by line d.{John DeLooze - Company Secretary} Actually, however, line c. represents joggling conditions. To bring line c. down to line d.{John DeLooze - Company Secretary} the efficiency of the steering when parking would have to be impossibly low. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||