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).
Trial modifications for the Phantom steering system.
| Identifier | ExFiles\Box 17\3\ Scan159 | |
| Date | 14th July 1927 | |
| To Hs.{Lord Ernest Hives - Chair} DA.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} c. to BJ. BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} X7430 R5/M14.7.27. PHANTOM STEERING MODIFICATIONS. X.8430 X.7430 We are sending for trial the following because we all feel certain that we might get some benefit if we could reduce the risk of the oil film breaking down. So with a large dia. worm having a slow angle (increased degree or irreversibility from the .940 Phantom) we give N.sch.2414 modified to .9 pitch. This has - (1) Larger nut giving greater area of threads 2.150". (2) Longer lever inside box from 1.750 to 2" (3) Shorter pendulum lever from 11" to 10". (Note bracketed to items 2 & 3: Reducing load on nut.) (4) Same speed of steering. The figure of merit for load will be 1.460. With this it leaves us the only remaining and great move of reducing the weight on the front wheels by - (a) Moving the weight back. (b) Lightening the parts forward of the centre. We must have however steering with a well bedded nut, and a well polished worm. R.{Sir Henry Royce} | ||