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).
Query about the reasons for a surprisingly large pivot inclination on the Goshawk model's front axle.
| Identifier | ExFiles\Box 21\4\ Scan132 | |
| Date | 13th January 1923 | |
| To Hs.{Lord Ernest Hives - Chair} from Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} X3525 Dal/M13.1.23. RE. FRONT AXLES. X.4547 X.4264 X.3525 X.3465 We recently had a request from BY's Dept. asking for final instructions as to the inclination of the pivots in the side view on 'Stork' and 'Heron'. This was because they intended to order the dies and wanted to make sure that the spring tables were at the correct angle before doing so. We wrote to them for some more information and they now tell us that on the Goshawk the inclination of the spring tables was altered to give a pivot lean of 3½° and that this was found to be necessary by the Expl: Dept. As this is rather a surprising figure we should be very much obliged if you could give us some more information. On 40/50 for instance it was found that wobbles developed if the inclination exceeded 1° 40 mins. and we propose to keep this limit on 'Stork' and 'Heron' because on account of the splaying in the front view it seemed likely that even less inclination in the side view than is the case now, would be permissible. In view however of the above information about Goshawk, we are uncertain what we should instruct. Was this large inclination found to be necessary as a result of the use of a plain thrust in the steering column? Is it in order to make the steering stable at speed or to provide self-centering? It will be noticed that it is the same angle as that you now report on the Delage. Any information you can give on this point would be useful at the present moment. With reference to the Delage steering, we are under the impression that this is a worm and sector or worm and wheel. contd | ||