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).
Failure of a Marles steering worm with larger tyres and proposing material and lubrication changes.
| Identifier | ExFiles\Box 153\4\ scan0090 | |
| Date | 20th January 1941 | |
| Rm {William Robotham - Chief Engineer} /FJH. {Fred J. Hardy - Chief Dev. Engineer} from Rm. {William Robotham - Chief Engineer} Steering general Rm. {William Robotham - Chief Engineer} 2/ML.20.1.41. 1300 MARLES STEERING WORM, WITH 7" OR LARGER TYRES. The failure of the steering on 4.B.50 suggests that the increased steering effort due to larger tyres proves too much for the existing steering design, if it is made in the present material. I shall be interested to know exactly what material Adamants use, compared with the material that Hoffmann's use for the follower, which we know to be the best obtainable. Can you see any objection to us using a full E.P. oil in the steering box? If not, we will try this on 30.G.VII. though the failure appears to be more due to crushing than chucking of the surfaces. Rm. {William Robotham - Chief Engineer} | ||