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).
Differences in steering systems for the Phantom III and 25/30 HP models.
| Identifier | ExFiles\Box 106\3\ scan0370 | |
| Date | 13th May 1936 | |
| X530 To E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Ev.{Ivan Evernden - coachwork} Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}3/KW.13.5.36. Ph.III and 25/30 HP. Steerings. Re E.3/HP.5.5.36. The reasons for the differences between the Ph.III and 25/30 HP. steerings are as follows. Cam Lead. Ph.III - 0.800"; 25/30 HP. - 0.700". The 0.700" lead is used on 25/30 HP. in conjunction with a long pendulum lever as it gives slightly better results as regards joggles. This lead cannot be used on Ph.III because we do not want a lower geared steering at present and the pendulum lever length cannot be increased owing to insufficient ground clearance. Cam Bearings. Ph.III - Adamant; 25/30 HP. - Timken. The 25/30 HP. specification was drawn up after that of Ph.III and is more up-to-date. Timken bearings will be standardised on Ph.III when they have been 10,000 miles tested. Wheel Bearings. Ph.III - Adamant; 25/30 HP. - Ball. The 25/30 HP. is also more up-to-date in this feature. This completes the list of differences between the two cars. We require a scheme for the use of ball bearings on the Ph.III wheel to suit 0.800" lead before we can test this feature. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||