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 comparing different experimental cars' immunity to 'joggles'.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 13 | |
| Date | 29th March 1927 guessed | |
| contd :- -2- which now suffers from joggles due to acquired freedom. We believe that the resistance which a worm and nut offer to initial movement has quite as much effect on joggles, as opposed to road shocks, as the actual worm lead. This belief is confirmed by experimental results, and we think accounts for some of the very marked differences which are encountered on steerings of the same type. It is doubtful if there is a steering in existance which could stand up to one of our 10,000 miles tests in France without becoming perfectly free with a consequent increase in susceptibility to joggles. In pursuance of the theory we examined four experimental cars which we could place very definitely with regard to relative immunity from 'joggles'. We took the load required at the extremity of the pendulum lever to start the steering wheel rotating. Tabulated, the results are :- Type of car. | Load on pend: ball end to start wheel rotating. | Remarks on a steering. Hispana. | Lbs. 13 - 15 | Very good immunity from joggles. Considering spring rating not unduly spongy. Relatively immune from joggles. 8-EX. .720 lead. 1500 lbs. | 7 - 9 | A very fair Phantom steering. 12-EX. .720 lead. 1500 lbs. | 4 - 5 | This is definitely a less satisfactory steering than 8-EX from the point of view of joggles. 14-EX. .720 lead. 1500 lbs. | 2 - 3 | This steering is thoroughly bad for joggles considering that it is a 40/50 HP. contd :- | ||